Question: According to the empirical rule, if the data form a bell-shape curve( normal distribution), approximately what percent of the observations will be contained within +_

According to the empirical rule, if the data form a bell-shape curve( normal distribution), approximately what percent of the observations will be contained within +_ 2 standard deviations from the arithmetic mean.

A. 99.7

B. 95.0

C. 68.3

D. 75.0

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