a. 2 of every 3 observations would fall between Ã�Â±1 standard deviation around the mean.
b. 4 of every 5 observations would fall between Ã�Â±1.28 standard deviations around the mean.
c. 19 of every 20 observations would fall between Ã�Â±2 standard deviations around the mean.
d. All of the above are true.
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