18 18 25 19 23 20 65 18 21 18 20 18 18 20 18 19 28 16 18 18 (a) Calculate the values of the sample mean and the standard deviation. (Round your standard deviation to four decimal places.) sample mean 21.9 yr standard deviation Xyr (b) Compute the upper quartile, the lower quartile, and the interquartile range. upper quartile lower quartile interquartile range mild outliers Xyr Xyr yr Enter a number. (c) Are there any mild or extreme outliers present in this data set? (Enter your answers as comma-separated lists. If there is no answer, enter NONE.) extreme outliers 65 X

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