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Suppose that the lifetimes of light bulbs are approximately normally? distributed, with a mean of 56 hours...

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Basic Math

Suppose that the lifetimes of light bulbs are approximatelynormally? distributed, with a mean of

56 hours and a standard deviation of 3.3 hours. With this?information, answer the following questions.?

(a) What proportion of light bulbs will lastmore than61 ?hours?

?(b) What proportion of light bulbs will last51hours or? less??

(c) What proportion of light bulbs will lastbetween59 and 62 hours??

(d) What is the probability that a randomlyselected light bulb lasts less than 45 ?hours?

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