Question

William wishes to view a frequency table for grouped data using his monthly credit card statements for the last 20 months,shown below. Construct the table for William using six classes.1312, 1303, 809, 1477, 1263, 1444,894, 1051, 1485, 1433, 1132, 1221, 1179, 945, 995, 1179, 1172, 1373, 906,955

Answer 1

According to the given table, there are 6 classes. We have to find the amplitude of each class as follows

`A=(1486-809)/(6)=113`

We use this amplitude to find the limits of the classes.

`\begin{gathered} 809+113=922 \\ 922+113=1035 \\ 1035+113=1148 \\ 1148+113=1261 \\ 1261+113=1374 \\ 1374+113=1487 \end{gathered}`

So, the intervals are shown in the image below

Now, we determine the frequency of each interval. Remember that the frequency refers to the numbers that fall into an interval.

The image below shows the frequency column.