Statistics Examples

$\begin{array}{c} Class & Frequency \\ 2 - 10 & 1 \\ 11 - 19 & 3 \\ 20 - 28 & 9 \end{array}$

Step 1

The cumulative frequency of a data class is the number of data elements in that class and all the previous classes.

$\begin{array}{c} Class & Frequency (f) & Cumulative - Frequency \\ 2 - 10 & 1 & 1 \\ 11 - 19 & 3 & 1 + 3 \\ 20 - 28 & 9 & 1 + 3 + 9 \end{array}$

Step 2

Simplify the cumulative frequency column.

$\begin{array}{c} Class & Frequency (f) & Cumulative - Frequency \\ 2 - 10 & 1 & 1 \\ 11 - 19 & 3 & 4 \\ 20 - 28 & 9 & 13 \end{array}$