Problem
A random sample of 30 college students is selected. Each student is asked how much time he or she spent on homework during the previous week. The following times (in hours) are obtained. \[ \begin{array}{l} 17,19,20,25,20,19,21,15,16,23,24,15,25,21,16,19,20,18, \\ 21,20,24,25,16,15,18,19,20,21,15,24 \end{array} \] Construct a frequency distribution for the data. Type the frequency for each data value. \begin{tabular}{|c|c|} \hline Hours Studied & Freq. \\ \hline 15 & $\square$ \\ \hline \end{tabular}
Solution
Step 1 ：A random sample of 30 college students is selected. Each student is asked how much time he or she spent on homework during the previous week. The following times (in hours) are obtained: 17,19,20,25,20,19,21,15,16,23,24,15,25,21,16,19,20,18,21,20,24,25,16,15,18,19,20,21,15,24.
Step 2 ：We are asked to construct a frequency distribution for the data and find the frequency for each data value.
Step 3 ：We start by finding the frequency of the value 15 in the data.
Step 4 ：The frequency of the value 15 in the data is \(\boxed{4}\).
