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
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The length of useful life of a fluorescent tube used
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