a restaurant automatically add an 18% tip to the bill. if the tip was $9, what was the bill before the tip was added, in dollars
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First, find the mean. You'll need it to compute the variance.
The variance of the sample is then computed with the formula
The standard deviation is the square root of the variance, so
The variance of the sample is then computed with the formula
The standard deviation is the square root of the variance, so