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

Multiple Choice

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