The following frequency distribution presents the weights in pounds (lb) of a sample of visitors to a health clinic.
$\begin{array}{cc}
\hline \text { Weight (lb) } & \text { Frequency } \
\hline 90-99 & 1 \
100-109 & 4 \
110-119 & 4 \
120-129 & 3 \
130-139 & 7 \
140-149 & 6 \
150-159 & 4 \
160-169 & 2 \
\hline
\end{array}$ What is the class width?
A) 11
B) 80
C) 10
D) 9

Question

Quizplus · Accepted Answer

The class width is the difference between the upper limit of one class and the lower limit of the next. For example, the difference between 99 (upper limit of the first class) and 100 (lower limit of the next class) is 1, but since we're dealing with a range that spans from one number to the next (e.g., 90-99), the actual width of each class is 10 (e.g., 100-109 minus 90-99).

The Following Frequency Distribution Presents the Weights in Pounds (Lb)