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old faithful geyser in yellowstone national park has a mean time of 85 minutes between eruptions with a standard deviation of 21.

old faithful geyser in yellowstone national park has a mean time of 85 minutes between eruptions with a standard deviation of 21.25 minutes if the interval of time between eruptions is normally distributed, find the probability that in a sample of 30 eruption intervals, the average interval of time between eruptions was
1- more than 75 minutes
b-between 78 and 83 minutes
c-less than 96 minutes

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