The "middle spread," that is the middle 50% of the normal distribution, is equal to plus or minus one standard deviation.

Name: The "middle spread," that is the middle 50% of the normal distribution, is equal to plus or minus one standard deviation.
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Quizplus · Accepted Answer

The "middle spread" or the middle 50% of the normal distribution actually falls within approximately plus or minus 0.6745 standard deviations from the mean, not one standard deviation.

The "Middle Spread," That Is the Middle 50% of the Normal