Statistics Examples

$\begin{array}{c} Class & Frequency \\ 10 - 14 & 1 \\ 15 - 19 & 3 \\ 20 - 24 & 9 \\ 25 - 29 & 2 \end{array}$

Step 1

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

$\begin{array}{c} Class & Frequency (f) & Cumulative - Frequency \\ 10 - 14 & 1 & 1 \\ 15 - 19 & 3 & 1 + 3 \\ 20 - 24 & 9 & 1 + 3 + 9 \\ 25 - 29 & 2 & 1 + 3 + 9 + 2 \end{array}$

Step 2

Simplify the cumulative frequency column.

$\begin{array}{c} Class & Frequency (f) & Cumulative - Frequency \\ 10 - 14 & 1 & 1 \\ 15 - 19 & 3 & 4 \\ 20 - 24 & 9 & 13 \\ 25 - 29 & 2 & 15 \end{array}$

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