A Survey Conducted in a College Intro Stats Class Asked $\begin{array}{|l|l|l|l|l|l|l|l|}\hline 10 & 10 & 12 & 14 & 15 & 15 & 15 & 15 \\\hline 17 & 17 & 19 & 20 & 20 & 20 & 20 & 22 \\\hline\end{array}$

A survey conducted in a college intro stats class asked students about the number of credit hours they were taking that quarter. The number of credit hours for a random sample of 16 students is given in the table.

$\begin{array}{|l|l|l|l|l|l|l|l|}\hline 10 & 10 & 12 & 14 & 15 & 15 & 15 & 15 \\\hline 17 & 17 & 19 & 20 & 20 & 20 & 20 & 22 \\\hline\end{array}$

a. Sketch a histogram of these data.
b. Find the mean and standard deviation for the number of credit hours. c. Find the median and IQR for the number of credit hours.
d. Is it more appropriate to use the mean and standard deviation or the median and IQR to summarize these data? Explain.