a. Find the z-score for x = 71 b. Find the z-score for x = 79 c. Find P(x > 79) att to rigst at detalt to rignol art
a. Find the z-score for x = 71 b. Find the z-score for x = 79 c. Find P(x > 79) att to rigst at detalt to rignol art
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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Question

Transcribed Image Text:12.) The lifespan, in hours, of a batch of batteries is normally distributed, with mean 75 and standard
deviation 6. Let x be the lifespan of a single, randomly chosen battery.
a. Find the z-score for x = 71
b. Find the z-score for x = 79
c. Find P(x>79)
d. Find P(x<71)
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e. Let x be the mean lifespan of a randomly chosen sample of 9 batteries. Find the z-score
for x = 71
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f. Find P(x<71)
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