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Can anyone help? Suppose that the lifetimes of light bulbs are approximately normally​ distributed, with a...

Can anyone help? 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 62 ​hours? ​

(b) What proportion of light bulbs will last 50 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 45 ​hours?

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Answer #1

losts 62 hours -O.0301 3-2 S9-56 G2-S6 2 R(ス 0.931 ct hous 3. 2

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