For a certain group of individuals, the average heart rate is 72 beats per minute. Assume the variable is normally distributed and the standard deviation is 3 beats per minute. If a subject is selected at random, find the probability that the person has the following heart rates: a) Between 68 and 74 beats per minute b) Higher than 70 beats per minute c) Less than 75 beats per minute

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A: It is an important part of statistics . It is widely used .

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