Chapter 6, Problem 17P

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8th Edition

Frederick J Gravetter + 1 other

ISBN: 9781133956570

Textbook Problem

A recent newspaper article reported the results of a survey of well-educated suburban parents. The responses to one question indicated that by age 2, children were watching an average of μ = 60 minutes of television each day. Assuming that the distribution of television-watching times is normal with a standard deviation of σ = 25 minutes, find each of the following proportions.

**a.**What proportion of 2-year-old children watch more than 90 minutes of television each day?**b.**What proportion of 2-year-old children watch less than 20 minutes a day?

**a.**

To determine

**To find:** The proportion of 2-year old children watch more than 90 minutes of television

each day.

Explanation

**Given info:** Score follows normal distribution with mean 60 and standard deviation 25

And the proportion of 2yrs old children watching television is found to be 90 minutes.

**Calculation:**

Let
*X* respectively. Then,

Let, *p* is the probability that 2yrs old children watching television is found to be 90 minutes.

**b.**

To determine

**To find:** The proportion of 2-year old children watch less than 20 minutes of television each day.

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