Question: I can not understand normal curve areas, please help and explain how to calculate. A random sample of n= 100 observations is drawn from a

I can not understand normal curve areas, please help and explain how to calculate.

A random sample of n=100 observations is drawn from a population with a mean equal to 60 and a standard deviation equal to 40.

a. Find the probability that x is less than 52

b. Find the probability that x is greater than 66

c. Find the probability that x falls between 52 and 72

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