Twenty randomly selected persons were asked to keep record of the number of times they used their debit cards during October 2015.
The following data show their responses.
                    5     32     41     14     21     72     19     6     26     7     8     9     18     5     91     14     1     10     8     13
a. Calculate the mean, median, and mode for these data.
b. Compute the 10% trimmed mean for these data.
c. Calculate the range, variance, and standard deviation for these data.
d. Compute the coefficient of variation.
e. Are the values of these summary measure calculated above population parameters or sample statistics? Explain.