Chapter 6.3, Problem 1LC

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8th Edition

Frederick J Gravetter + 1 other

ISBN: 9781133956570

Textbook Problem

For a normal distribution with a mean of μ = 60 and a standard deviation of σ = 12, find each probability value requested.

**a.** *p*(*X* > 66)

**b.** *p*(*X* < 75)

**c** *p*(*X* < 57)

**d.** *p*(48 < *X <* 72)

**(a)**

To determine

**To find:** The value of

Explanation

**Given info:**

The random variable *X* follows the normal distribution with mean

**Calculation:**

The formula for z score is,

Substitute the value 66 for *X*, 60 for

**(b)**

To determine

**To find:** The value of

**(c)**

To determine

**To find:** The value of

**(d)**

To determine

**To find:** The value of

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