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A survey of high school seniors shows that the average wake-up time the previous Saturday morning was μ = 9:45. Assume that the distribution of times is approximately normal with a standard deviation of σ = 65 minutes, and find each of the requested values. a. What proportion of high school seniors wake up later than 11:00? b. What is the probability of randomly selecting a high school senior who woke up before 9:00? c. What is the probability of obtaining a mean wake-up time earlier than M = 9:30 for a sample of n = 25 high school students?

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Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
Publisher: Cengage Learning
ISBN: 9781133956570
BuyFind

Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
Publisher: Cengage Learning
ISBN: 9781133956570

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Chapter
Section
Chapter 8, Problem 2RE
Textbook Problem

A survey of high school seniors shows that the average wake-up time the previous Saturday morning was μ = 9:45. Assume that the distribution of times is approximately normal with a standard deviation of σ = 65 minutes, and find each of the requested values.

a. What proportion of high school seniors wake up later than 11:00?

b. What is the probability of randomly selecting a high school senior who woke up before 9:00?

c. What is the probability of obtaining a mean wake-up time earlier than M = 9:30 for a sample of n = 25 high school students?

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Chapter 8 Solutions

Essentials of Statistics for the Behavioral Sciences
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