Age at diagnosis for each of 20 patients under treatment for meningitis was given in a research paper. Suppose the ages (in years) were as follows. 22 20 64 18 21 18 18 18 25 19 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 standard deviation mild outliers 20 18 yr yr (b) Compute the upper quartile, the lower quartile, and the interquartile range. upper quartile yr lower quartile yr interquartile range. yr (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

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