Instruction 2 -Referring to Instruction 2

Multiple Choice

Instruction 2.4
The following are the durations in minutes of a sample of long-distance phone calls made within Australia reported by one long-distance carrier.
$$\begin{array} { | l | l | } \hline \text { Time (in Minutes) } & \text { Relative Frequency } \\\hline0 \text { but less than 5 } & 0.37 \\\hline 5 \text { but less than 10 } & 0.22 \\\hline \begin{array} { l } 10 \text { but less than } \\15\end{array} & 0.15 \\\hline \begin{array} { l } 15 \text { but less than } \\20\end{array} & 0.10 \\\hline \begin{array} { l } 20 \text { but less than } \\25\end{array} & 0.07 \\\hline \begin{array} { l } 25 \text { but less than } \\30\end{array} & 0.07 \\\hline 30 \text { or more } & 0.02 \\\hline\end{array}$$
-Referring to Instruction 2.4,what is the width of each class?

A) 5 minutes
B) 100%
C) 2%
D) 1 minute