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

Suppose that the lifetimes of light bulbs are approximately normally​ distributed, with a mean of 56 hours and a standard deviation of 3.2 hours. With this​ information, answer the following questions. ​

(a) What proportion of light bulbs will last more than 60 ​hours?

​(b) What proportion of light bulbs will last 52 hours or​ less?

​(c) What proportion of light bulbs will last between 59 and 62 ​hours? ​

(d) What is the probability that a randomly selected light bulb lasts less than 46 ​hours?

Math   Statistics-And-Probability   
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