The daily numbers of calls received by the Internal Revenue Service office in July are shown below:
18, 12, 25, 16, 27, 32, 25, 15, 23, 22, 37, 16,
25, 19, 16, 25, 19, 16, 29, 38, 29, 30, 21
1) Find the mean of the set of data.
2) Find the median of the set of data.
3) Find the mode of the set of data.
4) Find the range of the set of data.
5) Find the standard deviation of the set of data.