SOLUTION: 8.1 #8 Suppose a geyser has a mean time between eruptions of 72 minutes. Let the interval of time between the eruptions be normally distributed with standard deviation 14 minutes.

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Question 1077776: 8.1 #8
Suppose a geyser has a mean time between eruptions of 72 minutes. Let the interval of time between the eruptions be normally distributed with standard deviation 14 minutes.
What is the probability that a randomly selected time interval between eruptions is longer than 79 ​minutes?

Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
z=(x-mean)/sd
z>7/14=1/2
that probability is 0.3085