Chapter 8, Problem 2RE

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8th Edition

Frederick J Gravetter + 1 other

ISBN: 9781133956570

Textbook Problem

A survey of high school seniors shows that the average wake-up time the previous Saturday morning was

**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?

**(a)**

To determine

**To find:** The proportion of high school senior’s wakeup later than 11:00.

Explanation

**Given info:**

The random variable *X* denote the distribution of times follows the normal distribution with mean of

**Calculation:**

The formula for z score is,

Substitute the value

**(b)**

To determine

**To find:** The probability of randomly selecting a high school senior who woke up before 9:00.

**(c)**

To determine

**To find:** The probability of obtaining a mean woke up earlier 9:30.

Sect-8.1 P-1LCSect-8.1 P-2LCSect-8.1 P-3LCSect-8.1 P-1LCASect-8.1 P-2LCASect-8.1 P-3LCASect-8.2 P-1LCSect-8.2 P-2LCSect-8.2 P-3LCSect-8.2 P-4LC

Sect-8.2 P-5LCSect-8.3 P-1LCSect-8.3 P-2LCSect-8.3 P-3LCSect-8.3 P-4LCSect-8.3 P-5LCSect-8.4 P-1LCSect-8.4 P-2LCSect-8.4 P-3LCSect-8.5 P-1LCSect-8.5 P-2LCSect-8.5 P-3LCSect-8.6 P-1LCSect-8.6 P-2LCSect-8.6 P-3LCSect-8.6 P-4LCCh-8 P-1PCh-8 P-2PCh-8 P-3PCh-8 P-4PCh-8 P-5PCh-8 P-6PCh-8 P-7PCh-8 P-8PCh-8 P-9PCh-8 P-10PCh-8 P-11PCh-8 P-12PCh-8 P-13PCh-8 P-14PCh-8 P-15PCh-8 P-16PCh-8 P-17PCh-8 P-18PCh-8 P-19PCh-8 P-20PCh-8 P-21PCh-8 P-1RECh-8 P-2RECh-8 P-3RE

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