question archive 1) The Bright Light Company tested a new line of photographic bulbs and found their lifetimes to be normally distributed with a mean lifetime of 98 hours and a standard deviation of 13 hours

1) The Bright Light Company tested a new line of photographic bulbs and found their lifetimes to be normally distributed with a mean lifetime of 98 hours and a standard deviation of 13 hours

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1) The Bright Light Company tested a new line of photographic bulbs and found their lifetimes to be normally distributed with a mean lifetime of 98 hours and a standard deviation of 13 hours.

a)     What percent of the bulbs last between 72 and 124 hours?

 

b)    What is the probability that a randomly selected bulb will last more than 111 hours?

 

c)     In a shipment of 1200 bulbs, how many would you expect to have a lifetime of less than 76 hours?

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