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To find the probability that the age of a randomly selected CEO.

The average age of CEOs is 56 years. Assume the variable is normally distributed. If the standard deviation is 4 years, find the probability that the age of a randomly selected CEO will be in the following range:

a. Between 53 and 59 years old.
b. Between 58 and 63 years old.
c. Between 50 and 55 years old.

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