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2. A manufacturer of fluorescent light bulbs advertises that the distribution of the lifespans of these...

2. A manufacturer of fluorescent light bulbs advertises that the distribution of the lifespans of these bulbs is normal with a mean of 9,000 hours and a standard deviation of 1,000 hours.

What is the probability that a randomly chosen light bulb lasts more than 9500 hours?

Describe the distribution of the mean span of 15 light bulbs.

What is the probability that the mean lifespan of 15 randomly chosen light bulbs is more than 9500 hours?

Math   Statistics-And-Probability   
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