SAT College

A box of nine iPhone 5C cellphones (the iPhone “for the colorful”) contains two yellow cellphones and seven green cellphones. (a) If two cellphones are randomly selected from the box, without replacement (the first cellphone is not returned to the box after it is selected), what is the probability that both cellphones selected will be green? (b) If two cellphones are randomly selected from the box, without replacement (the first cellphone is not returned to the box after it is selected), what is the probability that there will be one yellow cellphone and one green cellphone selected? (c) If three cellphones are selected, with replacement (the first cellphones are returned to the box after it is selected), what is the probability that all three will be yellow? (d) If you were sampling with replacement (the first cellphone is returned to the box after it is selected), what would be the answers to (a) and (b)? 3

Answers

Answer 1
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Related Questions

So sánh tư tưởng kinh tế và học thuyết kinh tế ?

Answers

Hoàn cảnh ra đời của các tư tưởng kinh tế trường phái ... sánh, tranh thủ các cơ hội để mở rộng thị trường tiêu thụ hàng hóa và dịch vụ;.

Which expression is equivalent to x2 - 12x + 11?
O (x+11)(x + 1)
O (x - 11)(x+1)
O (x + 11)(x - 1)
o (x - 11)(x - 1)

Answers

Answer: o (x - 11)(x - 1)

Explanation:

You can find two values that has a sum of -12 and a product of 11:

[tex]x^{2} -12x+11\\(x-11)(x-1)[/tex]

Or you can use the quadratic formula:

[tex]\frac{-b+-\sqrt{b^{2} -4ac} }{2a}[/tex]

Where:

a = 1b = -12c = 11

The valves in the heart open and close to move blood in between heart chambers. O a) three directions O b) two directions O c) four directions d) one direction

Answers

Answer:

  d) one direction

Explanation:

The purpose of the various valves in the circulatory system is to keep blood flowing in one direction. The valve opens to allow blood flow one way, and closes to prevent blood flow the other way.

Hi,

The valves in the heart open and close to move blood in between heart chambers.

Answer:

d) one direction

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