the most famous geyser in the world, old faithful in yellow stone national park, has a mean time between eruptions of 85 minuntes.

the most famous geyser in the world, old faithful in yellow stone national park, has a mean time between eruptions of 85 minuntes. if the interval of tiem between eruptions is normally distributed with standard deviation 21.25, then whats the probability that a randomly selected time interval between eruptions is longer than 95 minuntes