Consider the relative frequency distribution given $$\begin{array} { l c }
\text { Class Interval } & \text { Relative Frequency } \
\text { 20-under } 40 & 0.2 \
40 \text {-under } 60 & 0.3 \
60 \text {-under } 80 & 0.4 \
\text { 80-under } 100 & 0.1
\end{array}$$
There were 60 numbers in the data set.How many numbers were in the interval 20-under 40?
A)12
B)20
C)40
D)10
E)15

Question

Consider the relative frequency distribution given $$\begin{array} { l c } 
\text { Class Interval } & \text { Relative Frequency } \
\text { 20-under } 40 & 0.2 \
40 \text {-under } 60 & 0.3 \
60 \text {-under } 80 & 0.4 \
\text { 80-under } 100 & 0.1
\end{array}$$
There were 60 numbers in the data set.How many numbers were in the interval 20-under 40?
A)12
B)20
C)40
D)10
E)15

Quizplus · Accepted Answer

The relative frequency for the interval 20-under 40 is 0.2. Since there were 60 numbers in the data set, the number of numbers in this interval is $0.2 \times 60 = 12$.

Consider the Relative Frequency Distribution Given There Were 60 Numbers in the Data Set