Question: If a random variable has a normal distribution, what are the probabilities that it will take on a value within (a) 1 standard deviation of

If a random variable has a normal distribution, what are the probabilities that it will take on a value within

(a) 1 standard deviation of the mean;

(b) 2 standard deviations of the mean;

(c) 3 standard deviations of the mean;

(d) 4 standard deviations of the mean?

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