Consider the relative frequency distribution given below:
$$\begin{array} { l c }
\text { Class Interval } & \text { Relative Frequency } \
\text { 20-under } 40 & 0.2 \
40 \text {-under } 60 & 0.3 \
60 \text {-under } 80 & 0.4 \
\text { 80-under } 100 & 0.1
\end{array}$$
There were 60 numbers in the data set.How many numbers were in the interval 40-under 60?
A)30
B)50
C)18
D)12
E)15

Question

Consider the relative frequency distribution given below: 
$$\begin{array} { l c } 
\text { Class Interval } & \text { Relative Frequency } \
\text { 20-under } 40 & 0.2 \
40 \text {-under } 60 & 0.3 \
60 \text {-under } 80 & 0.4 \
\text { 80-under } 100 & 0.1
\end{array}$$
There were 60 numbers in the data set.How many numbers were in the interval 40-under 60?
A)30
B)50
C)18
D)12
E)15

Quizplus · Accepted Answer

The relative frequency for the interval 40-under 60 is 0.3. Since there were 60 numbers in the data set, the number of numbers in this interval is $0.3 \times 60 = 18$.

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