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The length of useful life of a fluorescent tube used for indoor gardening is normally distributed....

The length of useful life of a fluorescent tube used for indoor gardening is normally distributed. the useful life has mean of 600 hours and standard deviation of 40 hr. Determine the probability that

A. such a tube will last less than 740 hr

B. find the 44th percentile

math   Statistics-And-Probability   
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Answer #1

u- 600 hs Given- meam J Plx740)? 740-600 3.5 Z: 40 Px< th0)09928 940 for 44 peruntilh -Score - 015) xJutZ 593.9L

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