Mathematics, 30.03.2021 19:00, emma042902

A manufacturing company produces fluorescent light bulbs and claims that the average lifetime of its bulbs is 1600 hours with a standard deviation of 120 hours. Bulb lifetime is normally distributed, N(100, 120): If a single bulb is randomly selected, what is the probability that its lifetime is between 1480 hours and 1720 hours?

If 25 bulbs are randomly selected, what is the probability that the mean lifetime is between 1480 hours and 1720 hours?

3. If 100 bulbs are randomly selected, what is the probability that the mean lifetime is between 1480 hours and 1720 hours?

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A manufacturing company produces fluorescent light bulbs and claims that the average lifetime of its...