The print on the package of 100-watt General Electric soft-white
light-bulbs says that these bulbs have an average life of 750
hours. Assume that the lives of all such bulbs have a normal
distribution with a mean of 750 hours and a standard deviation of
55 hours. Find the probability that the mean life of a random
sample of 25 such bulbs will be
a. greater than 730 hours.
Round your answer to four decimal places.
b. within 15 hours of the population mean.
Round your answer to four decimal places.
The print on the package of 100-watt General Electric soft-white light-bulbs says that these bulbs have an average life
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The print on the package of 100-watt General Electric soft-white light-bulbs says that these bulbs have an average life
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