Question: If X is a random variable having a normal distribution, what are the probabilities of getting a value (a) Within one standard deviation of the

If X is a random variable having a normal distribution, what are the probabilities of getting a value
(a) Within one standard deviation of the mean;
(b) Within two standard deviations of the mean;
(c) Within three standard deviations of the mean;
(d) Within four standard deviations of the mean?

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