The life of a certain AAA batteries is normally distributed with a variance of 100 hours...
The life of a certain AAA batteries is normally distributed with a variance of 100 hours and mean of 550 hours. Find the probability that a battery chosen at random will last no more than 568 hours
Homework Answers
Given,
= 550 , 
=
sqrt(100) = 10
We convert this to standard normal as
P( X < x) = P( Z < x - / )
P( X < 568) = P( Z < 568 - 550 / 10)
= P( Z < 1.8)
= 0.9641
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