Suppose a geyser has a mean time between eruptions of 84 minutes. Let the interval of time between the eruptions be normally distributed with standard deviation 27 minutes. Complete parts (a) through (e) below. (a) What is the probability that a randomly selected time interval between eruptions is longer than 95 minutes? The probability that a randomly selected time interval is longer than 95 minutes is approximately 0.3419.

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Q: If n(A ∪ B) = 96 and n(A) = n(B) = 67, find n(A ∩ B).

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Q: qc 3 I D

A: P69C39 Pr=n!n-r!nCr=n!n-r!×r!            r!=r(r-1)(r-2).......×2×1n