3. At the start of the fall 2019 semester a STAT A200 section had 19 enrolled students. On the first day of class the ages (in years) of the students were as follows: 18 23 19 23 20 46 18 22 18 20 18 18 20 18 19 28 17 18 18 (a) Construct a boxplot for this dataset and comment on its shape. (b) Give the five-number summary for this dataset. (c) Find the mean and the standard deviation of this dataset. (d) What percentage of this dataset is within two standard deviations to either side of the mean? How does this percentage compare to Chebyshev's rule and the empirical rule