The results of a national survey showed that on average, adults sleep 6.9 hours per night. Suppose that the standard deviation is 1 hour and that the number of hours of sleep follows a bell-shaped istribution. If needed, round your answers to two decimal digits. If your answer is negative use "minus sign". (a) Use the empirical rule to calculate the percentage of individuals who sleep between 4.9 and 8.9 hours per day. Enter your answer as a percentage. % (b) What is the z-value for an adult who sleeps hours per night? (c) What is the z-value for an adult who sleeps 6 hours per night?
The results of a national survey showed that on average, adults sleep 6.9 hours per night. Suppose that the standard deviation is 1 hour and that the number of hours of sleep follows a bell-shaped istribution. If needed, round your answers to two decimal digits. If your answer is negative use "minus sign". (a) Use the empirical rule to calculate the percentage of individuals who sleep between 4.9 and 8.9 hours per day. Enter your answer as a percentage. % (b) What is the z-value for an adult who sleeps hours per night? (c) What is the z-value for an adult who sleeps 6 hours per night?
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:The results of a national survey showed that on average, adults sleep 6.9 hours per night. Suppose that the standard deviation is 1 hour and that the number of hours of sleep follows a bell-shaped
distribution. If needed, round your answers to two decimal digits. If your answer is negative use "minus sign".
(a) Use the empirical rule to calculate the percentage of individuals who sleep between 4.9 and 8.9 hours per day.
Enter your answer as a percentage.
%
(b) What is the z-value for an adult who sleeps 8 hours per night?
(c) What is the z-value for an adult who sleeps 6 hours per night?
Expert Solution
Step 1
Given that
Mean=M=6.9, Standard deviations=S=1
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