Bill kept track of the number of hours he spent exercising each week. The results for four months are shown below.
$$\begin{array} { l l l l l l }
9.0 & 9.0 & 8.2 & 7.4 & 6.5 & 9.0 \
7.5 & 8.2 & 6.7 & 9.0 & 7.4 & 8.1 \
9.0 & 9.0 & 9.0 & 8.8 & 6.5 & 7.5
\end{array}$$
A)8.3 hours
B)7.7 hours
C)8.1 hours
D)8.6 hours

Question

Bill kept track of the number of hours he spent exercising each week. The results for four months are shown below.
 $$\begin{array} { l l l l l l } 
9.0 & 9.0 & 8.2 & 7.4 & 6.5 & 9.0 \
7.5 & 8.2 & 6.7 & 9.0 & 7.4 & 8.1 \
9.0 & 9.0 & 9.0 & 8.8 & 6.5 & 7.5
\end{array}$$
A)8.3 hours
B)7.7 hours
C)8.1 hours
D)8.6 hours

Quizplus · Accepted Answer

To find the correct answer, add all the hours together and then divide by the total number of entries to find the average. The sum of all the hours is 163.1, and there are 20 entries. $163.1 \div 20 = 8.155$, which rounds to 8.1 hours, making option C correct.

Bill Kept Track of the Number of Hours He Spent