(Answered) The lifetime of light bulbs made by a certain manufacturer

Statistics

The lifetime of light bulbs made by a certain manufacturer are normal, with a mean of 1500 hours and a standard deviation of 200 hours.

What is the probability that the lifetime of the randomly selected bulb would be at most 1650 hours

What is the probability that the average lifetime of 25 bulbs would be no more than 1570 hours

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