Coal is carried from a mine in West Virginia to a power plant in New York in hopper cars on a long train. The automatic hopper car loader is set to put 88 tons of coal into each car. The actual weights of coal loaded into each car are normally distributed, with mean µ = 88 tons and standard deviation σ = 0.5 ton.
Required:
a. What is the probability that one car chosen at random will have less than 49.5 tons of coal?
b. What is the probability that 35 cars chosen at random will have a mean load weight of less than 49.5 tons of coal?
Answer:
a) 0% probability that one car chosen at random will have less than 49.5 tons of coal.
b) 0% probability that 35 cars chosen at random will have a mean load weight of less than 49.5 tons of coal.
Step-by-step explanation:
To solve this question, we need to understand the normal probability distribution and the central limit theorem.
Normal Probability Distribution
Problems of normal distributions can be solved using the z-score formula.
In a set with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the z-score of a measure X is given by:
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.
In this question:
[tex]\mu = 88, \sigma = 0.5[/tex]
a. What is the probability that one car chosen at random will have less than 49.5 tons of coal?
This is the p-value of Z when X = 49.5, so:
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
[tex]Z = \frac{49.5 - 88}{0.5}[/tex]
[tex]Z = -77[/tex]
[tex]Z = -77[/tex] has a p-value of 0.
0% probability that one car chosen at random will have less than 49.5 tons of coal.
b. What is the probability that 35 cars chosen at random will have a mean load weight of less than 49.5 tons of coal?
Now [tex]n = 35, s = \frac{0.5}{\sqrt{35}}[/tex]
So
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
By the Central Limit Theorem
[tex]Z = \frac{X - \mu}{s}[/tex]
[tex]Z = \frac{49.5 - 88}{\frac{0.5}{\sqrt{35}}}[/tex]
[tex]Z = -455.5[/tex]
[tex]Z = -455.5[/tex] has a p-value of 0.
0% probability that 35 cars chosen at random will have a mean load weight of less than 49.5 tons of coal
The terminal side of θ passes through the point (8,−7).
What is the exact value of cosθ in simplified form?
Answer:
8√113 / 113
Step-by-step explanation:
Representing the information on a triangle :
From trigonometry :
Cos θ = Adjacent / hypotenus = AC / AB
AB = hypotenus :
Using Pythagoras :
AB² = AC² + BC²
AB² = 8² + (-7)²
AB² = 64 + 49
AB = √113
Cos θ = AC / AB = 8 / √113
RATIONALIZE :
8/√113 * √113/√113 = 8√113 / 113
The physical plant at the main campus of a large state university recieves daily requests to replace florecent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a mean of 47 and a standard deviation of 6. Using the 68-95-99.7 rule, what is the approximate percentage of lightbulb replacement requests numbering between 47 and 65
Answer:
The approximate percentage of lightbulb replacement requests numbering between 47 and 65 is of 49.85%.
Step-by-step explanation:
The Empirical Rule states that, for a normally distributed random variable:
Approximately 68% of the measures are within 1 standard deviation of the mean.
Approximately 95% of the measures are within 2 standard deviations of the mean.
Approximately 99.7% of the measures are within 3 standard deviations of the mean.
In this problem, we have that:
Mean of 47, standard deviation of 6.
What is the approximate percentage of lightbulb replacement requests numbering between 47 and 65?
65 = 47 + 3*6
So 65 is three standard deviations above the mean, and this percentage is the percentage between the mean and 3 standard deviations above the mean.
The normal distribution is symmetric, which means that 50% of the measures are below the mean and 50% are above.
Of those 50% above, 99.7% are within 3 standard deviations of the mean, so:
0.997*0.5 = 0.4985.
0.4985*100% = 49.85%.
The approximate percentage of lightbulb replacement requests numbering between 47 and 65 is of 49.85%.
Question 14 please show ALL STEPS
List of possible integral roots = 1, -1, 2, -2, 3, -3, 6, -6
List of corresponding remainders = 0, -16, -4, 0, 0, 96, 600, 1764
Check out the table below for a more organized way to represent the answer. The x values are the possible roots while the P(x) values are the corresponding remainders.
====================================================
Explanation:
We'll use the rational root theorem. This says that the factors of the last term divide over the factors of the first coefficient to get the list of all possible rational roots.
We'll be dividing factors of 6 over factors of 1. We'll do the plus and minus version of each. Since we're dividing over +1 or -1, this means that we're basically just looking at the plus minus of the factors of 6.
Those factors are: 1, -1, 2, -2, 3, -3, 6, -6
This is the list of possible integral roots.
Basically we list 1,2,3,6 with the negative versions of each value thrown in as well.
---------------------------------
From there, you plug each value into the P(x) function
If we plugged in x = 1, then,
P(x) = x^4 - 3x^3 - 3x^2 + 11x - 6
P(1) = (1)^4 - 3(1)^3 - 3(1)^2 + 11(1) - 6
P(1) = 1 - 3 - 3 + 11 - 6
P(1) = 0
This shows that x = 1 is a root, since we get a remainder 0. Do the same for the other possible rational roots listed above. You should find (through trial and error) that x = -2 and x = 3 are the other two roots.
You decide to move out of your college's dorms and get an apartment, and you want to discuss the budget with your roommate. You know that your monthly grocery bill will depend on a number of factors, such as whether you are too busy to cook, whether you invite guests for meals frequently, how many special holiday meals you will cook, etc. In particular, G will have an approximate normal distribution with a variance of 2500 and a mean:
μ=300+10M−100B+50H
Where M is the number of meals to which you invite guests, and E[M]=8. B is a measure for how busy you are and assume it is U[0,1]. H is a variable that takes on the value 1 for holiday months of November, December, and January and 0 otherwise.
a. What is the mean of G in a November, where M=10 and B=0.5?
b. What is E(G)?
answer:
a. 400
b. 342.5
Step-by-step explanation:
The mean in this question has been given as
μ=300+10M−100B+50H
where M = 10
B = 0.5
H = 1
we put these into the formula of the mean above
μ=300+10(10)−100(0.5)+50(1)
μ = 300 + 100 - 50 + 50
= 400
So the mean of G in november is = 400
b. We are to find E[G] here
= E[ 300+10M−100B+50H]
m = 8
B = 0.5 or 1/2
h = 1/4
E[ 300+10x8−100x0.5+50*0.25]
= 300+80-50+12.5
= 342.5
the value for E[G] is therefore 342.5
thank you
solve the triangle given 28° angle and adj side of 210
Answer:
Tan(28) = x/210
Step-by-step explanation:
111.65^2 + 210^2 = hyp^2
opposite = 111.65
hypotenuse = 237.83
Answer:
hypotenuse =237.84
opposite =111.66
Step-by-step explanation:
cos‐¹(210/x)=28
210/x =cos28
210=cos28x
divide by cos28
x=237.84 (hypotenuse)
sin28= x/237.84
x=sin28×237.84
x=111.66 (opposite)
(another way to do it)
Find x on this triangle
X is the hypotenuse. Using the given angle and side dimension use the law of sins.
Sin( angle) = opposite leg/ hypotenuse
Sin(30) = 5/2 / x
X = 5/2 / sin(30)
X = 5
The answer is x = 5
Karissa determines the area of her desk by multiplying 45.72 centimeters and 60.95 centimeters. She states that the area is 2786.634 square centimeters. Which best describes the reasonableness of Karissa’s solution?
A. The solution is unreasonable because 50 times 60 is 3,000, not 2,786.
B. The solution is reasonable because 50 times 60 is 3,000, which is close to the computed area.
C. The solution is unreasonable because there are four decimal places in the factors and only three decimal places in the product.
D. The solution is reasonable because there are four numbers to the left of the decimal in the factors and four numbers to the left of the decimal in the product.
Helppp
Answer:
b
Step-by-step explanation:
45.72*60.95 =2786.634, which means that the solution is reasonable.
in b, they used the method of estimation which is a quick method to check if the answer is right.
d doesnt make sense as the decimal places do not have to remain the same number after u multiply them, moreover there's only 2 dp in the factors
write your answer in simplest radical form
9514 1404 393
Answer:
n = 2
Step-by-step explanation:
The ratio of side lengths in a 30°-60°-90° triangle is ...
1 : √3 : 2
We have the ratio ...
n : 2√3 : hypotenuse
from which we can see the basic ratio has been multiplied by 2. That is, n = 2 so the sides of the triangle shown have the ratio ...
2 : 2√3 : 4
Write the equation of the line that passes through the points (1,-7)(1,−7) and (-6,-9)(−6,−9). Put your answer in fully reduced point-slope form, unless it is a vertical or horizontal line.
Answer:
6x+6)(6+4)
Step-by-st(ep explanation:
nbpbf wefqlbwpoi
Answer:
y+7=2/7x-2/7
Step-by-step explanation:
So we first want to find the slope. It's calculated by taking the difference in y values and dividing it by the difference in x values.
-9-(-7)/-6-1
=-9+7/-7
=-2/-7
=2/7.
This is the m in the point-slope equation.
Next, we just plug in the points. We only need 1 point so I will use the (1,-7)
y-y1=m(x-x1)
y-(-7)=2/7(x-1)
y-(-7)=2/7x-2/7
y+7=2/7x-2/7
I've never really seen fully reduced point-slope form, but I'm assuming the above is it because if I keep simplifying it's going to turn into slope-intercept form.
The Richter scale measures the magnitude, M, of an earthquake as a function of its intensity, I, and the intensity of a reference earthquake, . Which equation calculates the magnitude of an earthquake with an intensity 10,000 times that of the reference earthquake?
Answer:
M = log(10,000)
Got it correct on Edmentum
Answer:
see photo
Step-by-step explanation:
Plato/Edmentum
Does the point (0, 0) satisfy the equation y = 2x?
Answer:
It does.
Step-by-step explanation:
y=2x
(0)=2(0)
0=0
Answer:
Yes, the point satisfies the equation
Step-by-step explanation:
Hi there!
We want to see if the point (0,0) will satisfy the equation y=2x
In other words, we want to see if the point will pass through the equation of the line
If a point passes through the equation, the values of the point will create a true statement if they are substituted into the equation
So substitute 0 for x and 0 for y to see if it will create a true statement
0=2(0)
multiply
0=0
The end result is a true statement, so the point passes through the equation
Hope this helps!
Avery made 6 litres of hot chocolate for the 4th annual bonfire with his family. If
each cup holds of a litre of liquid, how many cups can Avery fill?
Answer:
Avery can hold 6 cups
Step-by-step explanation:
so you have a 6 litre of hot chocolate and for every cup you remove 1 litre of hot chocolate wich makes you get 6 cups of hot chocolate
Which of the following is a geometric sequence where a1 = 4 and r = 3?
Answer:
4, 12, 36, 108.... continue multiplying by 3
Plz help me find a on the triangle show work plz
Answer:
x = sqrt(11)
Step-by-step explanation:
Since this is a right triangle, we can use the Pythagorean theorem
a^2+b^2 = c^2 where a and b are the sides and c is the hypotenuse
x^2 +(sqrt(5))^2 = 4^2
x^2 +5 = 16
x^2 =16-5
x^2 = 11
Taking the square root of each side
x = sqrt(11)
Rosa and Mary went to the store and spent more than $60. Write an inequality to represent this amount. Graph the inequality on a number line
What point slope form equation could be produced with the points(-3,-6)and (3,-3)
Answer:
y+6=1/2(x+3)
Step-by-step explanation:
Hi there!
We want to find the equation of the line in point-slope form that passes through (-3, -6), and (3, -3)
Point-slope form is given as y-[tex]y_{1}[/tex]=m(x-[tex]x_{1}[/tex]) where ([tex]x_{1}[/tex], [tex]y_{1}[/tex]) is a point and m is the slope
We don't know the slope of the line, so let's find it
The formula for the slope (m) calculated from two points is [tex]\frac{y_{2}-y_{1}}{x_{2}-x_{1}}[/tex], where ([tex]x_{1}[/tex], [tex]y_{1}[/tex]) and ([tex]x_{2}[/tex], [tex]y_{2}[/tex]) are points
We have two points, but let's label their values to avoid any confusion
[tex]x_{1}[/tex]=-3
[tex]y_{1}[/tex]=-6
[tex]x_{2}[/tex]=3
[tex]y_{2}[/tex]=-3
Now substitute into the formula (remember: the formula has SUBTRACTION)
m=[tex]\frac{-3--6}{3--3}[/tex]
simplify
m=[tex]\frac{-3+6}{3+3}[/tex]
m=[tex]\frac{3}{6}[/tex]
m=1/2
So the slope of the line is 1/2
Now that we have everything needed for point-slope form (a point and the slope), substitute the values into the formula (remember: the formula has SUBTRACTION)
y-[tex]y_{1}[/tex]=m(x-[tex]x_{1}[/tex])
y--6=1/2(x--3)
simplify
y+6=1/2(x+3)
Hope this helps!
A sofa is on sale for $703, which is 26% less than the regular price what is the regular price?
Multiply the monomials:
-11x^2y and 0.3x^2y^3
Answer:
-3.3x^4y^4
Step-by-step explanation:
-11x^2y and 0.3x^2y^3
-11x^2y * 0.3x^2y^3
Multiply the constants
-11 * .3 = -3.3
Multiply the x terms
We know that a^b*a^c = a^(b+c)
x^2 * x^2 = x^(2+2) = x^2
Multiply the y terms
y * y^3 = y^(1+3) = y^4
Put them all together
-3.3x^4y^4
You have a dog-walking business. You charge $12 per hour. Let's define n as the amount you earn and h as the number of
hours you work. You want to make $30, so you figure you need to work 2.5 hours.
Sort the solution methods by whether they are correct or incorrect methods to solve the problem.
Answer:
[tex]n = 12h[/tex]
Step-by-step explanation:
Given
[tex]r = 12/hr[/tex] --- rate
[tex]h \to hours[/tex]
[tex]n \to amount[/tex]
Required
Determine which solution is correct or incorrect
The solutions are not given. So, I will provide a general explanation
The amount (n) is calculated as:
[tex]n = r * h[/tex]
So, we have:
[tex]n = 12 * h[/tex]
[tex]n = 12h[/tex]
The above is the general equation to solve for the amount, given h hours
When h = 2.5, we have:
[tex]n = 12*2.5[/tex]
[tex]n = 30[/tex]
Answer:
going to add a picture
Step-by-step explanation:
:)
2. Write the numeral for four thousand and twelve
Can anyone help with problem 5?
Answer:
Other leg: 25 cm
Hypotenuse: 25√2 cm
Step-by-step explanation:
Hi there!
We are given a 45°-45°-90° triangle, and one leg (a side that makes up the right triangle) measures 25 cm
We want to find the length of the other sides
First, let's find the length of the other leg
A 45°-45°90° triangle is actually an isosceles triangle, and if it was to be drawn, the base angles are 45 and 45 degrees
That means the legs of the right triangle are actually the legs in the isosceles triangle as well
So the other leg is also 25 cm
Now, let's find the length of the hypotenuse, which is the side OPPOSITE from the 90° angle
You can solve for the other side using Pythagorean Theorem if you wish, however, there is a shortcut to finding the hypotenuse
In a 45°-45°-90° triangle, if the length of the legs are a, then the hypotenuse is a√2 cm
So that means the length of the hypotenuse in this case is 25√2 cm
Hope this helps!
Which statements about the box plot are correct? Check all that apply.
A box and whisker plot. The number line goes from 30 to 80. The whiskers range from 34 to 76, and the box ranges from 42 to 70. A line divides the box at 46.
Fifty percent of the data values lies between 34 and 46.
Seventy-five percent of the data values lies between 42 and 70.
It is unlikely that there are any outliers.
The interquartile range is 24.
The range is 36.
Answer: The answers are option 1 and option 3
Hope it helps
Answer:i would say A & C
Step-by-step explanation: makes the most sense
use the figure to find n please.
Answer:
n = 5
Step-by-step explanation:
Since this is a right triangle, we can use trig
tan theta = opp /adj
tan 30 = n / 5 sqrt(3)
5 sqrt(3) tan 30 = n
5 sqrt(3) * 1/ sqrt(3) = n
5 = n
Now we have to,
find the required value of n.
Now we can,
Use the trigonometric functions.
→ tan(θ) = opp/adj
Let's find the required value of n,
→ tan (θ) = opp/adj
→ tan (30) = n/5√3
→ n = 5√3 × tan (30)
→ n = 5√3 × √3/3
→ n = 5√3 × 1/√3
→ [n = 5]
Hence, the value of n is 5.
uog;;ooooooooooooooooooooooooooooooooooo ml
Answer:
D
Step-by-step explanation:
: Find the value of the trigonometric ratio. Make sure to simplify the If needed
Answer:
24/7
Step-by-step explanation:
tan A = opp/adj
For angle Z, the adjacent leg is 14, and the opposite leg is 48.
tan Z = 48/14
tan Z = 24/7
It's possible to build a triangle with side lengths of 5, 5, and 10.
A. True
B. False
Answer:
False
Step-by-step explanation:
You use the pythagorean theorem to solve this.
Each side must be multiplied by itself.
5x5= 25
5x5 = 25
10x10 = 100
25 + 25 does not equal 100.
10 is going to be your longest side.
The shorter sides do not add up to your longest side. So the answer is false.
Neil plants barley on 3/5 of each acre of his
farmland. He plants wheat on the rest
of each acre. Neil has 24 acres of land.
How many acres are wheat? Select all the
expressions that can solve the problem. (I’m asking again because no helped me the first time.)
A) 24 X (1 - 3/5 )
B) 24 X 2
______
5
C) 24 X 3
_____
5
D) 24 X 2/5
E) 24 X 3/5
Answer:
c
Step-by-step explanation:
Plan production for the next year. The demand forecast is: spring, 20,600; summer, 9,400; fall, 15,400; winter, 18,400. At the beginning of spring, you have 69 workers and 1,030 units in inventory. The union contract specifies that you may lay off workers only once a year, at the beginning of summer. Also, you may hire new workers only at the end of summer to begin regular work in the fall. The number of workers laid off at the beginning of summer and the number hired at the end of summer should result in planned production levels for summer and fall that equal the demand forecasts for summer and fall, respectively. If demand exceeds supply, use overtime in spring only, which means that backorders could occur in winter. You are given these costs: hiring, $130 per new worker; layoff, $260 per worker laid off; holding, $21 per unit-quarter; backorder cost, $9 per unit; regular time labor, $11 per hour; overtime, $17 per hour. Productivity is 0.5 unit per worker hour, eight hours per day, 50 days per quarter.
Find the total cost of this plan. Note: Hiring expense occurs at beginning of Fall. (Leave no cells blank - be certain to enter "O" wherever required.) Fall 15,400 Winter 18,400 15,400 30,800 77 18,400 36,800 77 Spring Summer Forecast 20,600 9,400 Beginning inventory I 1,030 Production required 9,400 Production hours required 39,140 18,800 Regular workforce 69 47 Regular production Overtime hours Overtime production Total production Ending inventory Ending backorders Workers hired Workers laid off Spring Summer Fall Winter Straight time Overtime Inventory Backorder Hiring Layoff Total Total cost
If Bob gains 15 pounds, then the ratio of Bob's weight to Tom's weight would be 7 to 5. If Tom weighs 115 pounds, what is Bobs weight now?
Answer:
Step-by-step explana:
-115/5= 23
-23x7=16 1
-161-15=146
Answer:
146 pounds.
Step-by-step explanation:
7 : 5 = 12
? : 115 = ?
115 / 5 = 23
23 x 7 = 161
161 - 15 = 146
The answer is 146.
