$$\begin{array}{l}
\text { For the data set below, find the first quartile. }\
\begin{array} { l l l l l l l l l l l }
\hline 78 & 65 & 63 & 67 & 67 & 64 & 72 & 78 & 75 & 65 & 74 \
\hline
\end{array}
\end{array}$$
A) 50
B) 75
C) 63
D) 65

Question

$$\begin{array}{l}
\text { For the data set below, find the first quartile. }\
\begin{array} { l l l l l l l l l l l } 
\hline 78 & 65 & 63 & 67 & 67 & 64 & 72 & 78 & 75 & 65 & 74 \
\hline
\end{array}
\end{array}$$
A) 50
B) 75
C) 63
D) 65

Quizplus · Accepted Answer

First, arrange the data in ascending order: 63, 64, 65, 65, 67, 67, 72, 74, 75, 78, 78. The first quartile (Q1) is the median of the first half of the data. For 11 data points, Q1 is the median of the first 5 data points after sorting. Thus, Q1 = 65.

A) 50 B) 75 C) 63 D) 65

A) 50
B) 75
C) 63
D) 65