$$\begin{array}{l}
\text { Use the given frequency distribution to approximate the mean. }\
\begin{array} { c c }
\hline \text { Class } & \text { Frequency } \
\hline 0 - 9 & 18 \
10 - 19 & 18 \
20 - 29 & 9 \
30 - 39 & 9 \
40 - 49 & 9
\end{array}
\end{array}$$
A) 12.6
B) 14
C) 14.1
D) 20.7

Question

$$\begin{array}{l}
\text { Use the given frequency distribution to approximate the mean. }\
\begin{array} { c c } 
\hline \text { Class } & \text { Frequency } \
\hline 0 - 9 & 18 \
10 - 19 & 18 \
20 - 29 & 9 \
30 - 39 & 9 \
40 - 49 & 9
\end{array}
\end{array}$$
A) 12.6
B) 14
C) 14.1
D) 20.7

Quizplus · Accepted Answer

To approximate the mean, calculate the midpoint of each class, multiply each midpoint by the class frequency, sum these products, and divide by the total frequency. Midpoints are 4.5, 14.5, 24.5, 34.5, and 44.5. The calculation is $\frac{(4.5*18)+(14.5*18)+(24.5*9)+(34.5*9)+(44.5*9)}{63} = 20.7$.

A) 126 B) 14 C) 14

A) 126
B) 14
C) 14