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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 61 ​hours? ​(b) What proportion of light bulbs will last 50 hours or​ less? ​(c) What proportion of light bulbs will last between 58 and 62 ​hours? ​(d) What is the probability that a randomly selected light bulb lasts less than 45 ​hours? ​(a) The proportion of light bulbs that last more than 61 hours is nothing.

Please answer A-D and not just A. Thanks!

Math   Statistics-And-Probability   
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