(Answered) Determining the number of major earthquakes

Statistics

Problem: The number of major earthquakes in a year is approximately normally distributed with a mean of 20.8 and a standard deviation of 4.5.

Required:

Question 1: Find the probability that in a given year there will be less than 21 earthquakes.

Question 2: Find the probability that in a given year there will be between 18 and 23 earthquakes.

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