Show that for a normal distribution, the probability within a) 1.28 standard deviations from the mean is

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Show that for a normal distribution, the probability within
a) 1.28 standard deviations from the mean is 0.80.
b) 1.96 standard deviations from the mean is 0.95.
c) 2.57 standard deviations from the mean is 0.99.

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