If a Particular Batch of Data Is Approximately Normally Distributed

Multiple Choice

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.