The lifetimes of fluorescent light bulbs are normally distributed with a mean of 1,500 hours and a s
Question: The lifetimes of fluorescent light bulbs are normally distributed with a mean of 1,500 hours and a standard deviation of 200 hours. (2 pts each)
a. What is the probability that a bulb selected at random will have a lifetime that exceeds 1,490 hours?
b. If a random sample of 100 bulbs is selected, what is the probability that the mean of the sample will exceed 1,490 hours?
c. If a random sample of 10 bulbs is selected, what is the probability that the mean of the sample will exceed 1,490 hours?
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