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 the eruptions is normally distributed with a standard deviation 21.25 minutes. ​(b) What is the probability that a random sample of 6 time intervals between eruptions has a mean longer than 97?                                                                                                                      The probability that the mean of a random sample of 6 time intervals is more than 97 minutes is approximately?

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