2/3 of a cherry pie is left .Supposed 4 friends want to share it equally what fraction names how much the whole pie each friend
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The interval 
corresponds to the part of the distribution lying within 2 standard deviations of the mean (since 500-2*100=300 and 500+2*100=700). The empirical rule states that approximately 95% of the distribution is expected to fall in this range.