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mean minus 2 standard deviation
mean 2 standard deviations
mean plus minus standard deviation
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within two standard deviations of the mean
x minus mean divided by standard deviation
plus or minus 3 standard deviations
standard deviation plus or minus
mean minus 2 standard deviation, mean 2 standard deviations, mean plus minus standard deviation, mean plus minus standard deviation formula, within two standard deviations of the mean, x minus mean divided by standard deviation, plus or minus 3 standard deviations, standard deviation plus or minus
