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If a particular batch of data is approximately normally distributed, we would find that approximately:

If a particular batch of data is approximately normally distributed, we would find that approximately:
a. 2 of every 3 observations would fall between �±1 standard deviation around the mean.
b. 4 of every 5 observations would fall between �±1.28 standard deviations around the mean.
c. 19 of every 20 observations would fall between �±2 standard deviations around the mean.
d. All of the above are true.

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