The life of light bulbs is distributed normally. The variance of the lifetime is 400400 and...
The life of light bulbs is distributed normally. The variance of the lifetime is 400400 and the mean lifetime of a bulb is 600600 hours. Find the probability of a bulb lasting for at most 633633 hours. Round your answer to four decimal places.
Homework Answers
Solution :
Given that,
mean = 
= 600
2=
400
standard deviation =
= 20
P(X< 633) = P[(X-
) /
< (633-600) /20 ]
= P(z <1.65 )
Using z table
= 0.9505
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