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  3. a dishwasher has a mean lifetime of 12 years with

A dishwasher has a mean lifetime of 12 years with an estimated standard deviation of...

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A dishwasher has a mean lifetime of 12 years with an estimated standard deviation of 1 25 years Assume the lifetime of a dishwasher is normally distributed Round the probabilities to four decimal places It is possible with rounding for a probability to be 0 0000 a State the random variable rv X the lifetime of a randomly selected dishwasher b Find the probability that a randomly selected dishwasher has a lifetime of 12 95 years or more 0 2236 c Find the probability that a randomly selected dishwasher has a lifetime of 15 75 years or less 0 9987 d Find the probability that a randomly selected dishwasher has a lifetime between 12 95 and 15 75 years 0 7751 A e Find the probability that randomly selected dishwasher has a lifetime that is at most 8 875 years f Is a lifetime of 8 875 years unusually low for a randomly selected dishwasher Why or why not Select an answer g What lifetime do 40 of all dishwashers have less than Round your answer to two decimal places in the first box Put the correct units in the second box

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