A manufacturer knows that their items have a normally distributed lifespan, with a mean of 2.8 years, and standard deviation of 0.7 years. If you randomly purchase 7 items, what is the probability that their mean life will be longer than 3 years?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 3GP
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A manufacturer knows that their items have a normally distributed lifespan, with a mean of 2.8
years, and standard deviation of 0.7 years.
If you randomly purchase 7 items, what is the probability that their mean life will be longer than 3
years?
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OCT
étv S
80
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F4
F5
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品
Transcribed Image Text:A manufacturer knows that their items have a normally distributed lifespan, with a mean of 2.8 years, and standard deviation of 0.7 years. If you randomly purchase 7 items, what is the probability that their mean life will be longer than 3 years? Question Help: Message instructor Submit Question OCT étv S 80 F2 F3 DII DE F4 F5 F6 F7 F8 品
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