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Suppose that the lifetimes of light bulbs are approximately normally distributed, with a mean of 57 hours and a standard deviation of 3.5 hours. With

Suppose that the lifetimes of light bulbs are approximately normally distributed, with a mean of 57 hours and a standard deviation of 3.5 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 53 hours or less?

c. What proportion of light bulbs will last between 59 and 61 hours?

d. What probability that a randomly selected light bulb lasts less than 45 hours?

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