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A manufacturer of a printer determines that the mean number of days before a cartridge runs out of ink is 75 days, with a standard

A manufacturer of a printer determines that the mean number of days before a cartridge runs out of ink is 75 days, with a standard deviation of 6 days. Assuming a normal distribution, what is the probability that the number of days will be less than 67.5 days? More than 88?

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