An hourly wage is normally distributed with a mean of $6.75 and a standard deviation of $0.55. What is the probability that an employee’s hourly wage is between $5.65 and $7.30 *
5 points
81.5%
68%
13.5%
95%

Answers

Answer 1

Answer:

Option A. 81.5%

Explanation:

Population mean, [tex]\mu = 6.75[/tex]

Standard deviation, [tex]\sigma = 0.55[/tex]

The question is to find [tex]p(5.65 < \bar{x} < 7.30)[/tex]

The z value is given by the formula:

[tex]z = \frac{\bar{x} - \mu}{\sigma}[/tex]

z - value corresponding to the mean, [tex]\bar{x} = 5.65[/tex]:

[tex]z_1 = \frac{5.65 - 6.75}{0.55}\\z_1 =-2.0[/tex]

z - value corresponding to the mean, [tex]\bar{x} = 7.30[/tex]:

[tex]z_1 = \frac{7.30 - 6.75}{0.55}\\z_1 =1.0[/tex]

[tex]p(5.65\leq \bar{x} \leq 7.30) = p(-2.0 \leq z \leq 1.0)\\p(-2.0 \leq z \leq 1.0) = p(z\leq 1) - p(z\leq -2)\\ p(-2.0 \leq z \leq 1.0) = 0.84134 - 0.02275\\p(-2.0 \leq z \leq 1.0) = 0.81859 \\p(-2.0 \leq z \leq 1.0) = 0.82[/tex]

Probability that an employee’s hourly wage is between $5.65 and $7.30 = 81.5%

Answer 2

The probability that an employee’s hourly wage is between $5.65 and $7.30 is 81.5%.

Z score is used to determine by how many standard deviation the raw score is above or below the mean. It is given by:

[tex]z=\frac{x-\mu}{\sigma} \\\\\mu=mean,\sigma=standard\ deviation,x=raw\ score\\\\\mu=6.75,\sigma=0.55\\\\For\ x=5.65\\\\z=\frac{5.65-6.75}{0.55}=-2\\\\\\For\ x=7.30\\\\z=\frac{7.30-6.75}{0.55} =1[/tex]

P(-2 < z < 1) = P(z < 1) - P(z < -2) = 81.5%

The probability that an employee’s hourly wage is between $5.65 and $7.30 is 81.5%.

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Answer:

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Answer:

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Explanation:

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Step 1.

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Answers

Answer:

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Answers

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Answers

Answer:

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Answer:

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Explanation:

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