At rehearsal for the school play, jack sings three times as many songs as Jennifer, and then dances to 5 more songs, just to sho
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The empirical rule says that approximately 68% of any normal distributed data set lies within one standard deviation of the mean.
The same rule states that about 95% lies within two standard deviations of the mean. Using this rule, and the fact that any normal distribution is symmetric about its mean, you have