For the following distribution,how many people had scores less than X = 20?? $$\begin{array} { l l }
\mathrm { X } & \mathrm { f } \
20 - 25 & 2 \
15 - 19 & 5 \
10 - 14 & 4 \
5 - 9 & 1 \
\hline
\end{array}$$
A)?5
B)?10
C)?11
D)?12

Question

For the following distribution,how many people had scores less than X = 20?? $$\begin{array} { l l } 
\mathrm { X } & \mathrm { f } \
20 - 25 & 2 \
15 - 19 & 5 \
10 - 14 & 4 \
5 - 9 & 1 \
\hline
\end{array}$$
A)?5
B)?10
C)?11
D)?12

Quizplus · Accepted Answer

To find the number of people who had scores less than X = 20, we need to add the frequencies of all the categories with X values less than 20. The categories with X values less than 20 are: 15-19, 10-14, and 5-9. 
So, the total frequency of people with scores less than X = 20 is 5+4+1=10. Therefore, the best choice is B) 10.

For the Following Distribution,how Many People Had Scores Less Than Xf20−25215−19510−1445−91\begin{array} { l l } \mathrm { X } & \mathrm { f } \\20 - 25 & 2 \\15 - 19 & 5 \\10 - 14 & 4 \\5 - 9 & 1 \\\hline\end{array}X20−2515−1910−145−9​f2541​​

For the Following Distribution,how Many People Had Scores Less Than $\begin{array} { l l } \mathrm { X } & \mathrm { f } \\20 - 25 & 2 \\15 - 19 & 5 \\10 - 14 & 4 \\5 - 9 & 1 \\\hline\end{array}$