Eruptions normally distributed with standard deviation

Reference no: EM1385302

The most famous geyser in the world, Old Faithful in Yellowstone National Park, has a mean time between eruptions of 85 minutes. If the interval of time between eruptions is normally distributed with standard deviation 21.25 minutes, answer the following question:

What is the probability that a random sample of 20 time intervals between eruptions has a mean longer than 95 minutes?

Reference no: EM1385302

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