A shelter house has a floor area of 400 squard feet. If 3 identical shelter house are bulit, what is the combined floor area of
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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