Standard deviation for grouped data (from frequency distribution). This display is from an Excel program, Standard Deviation (xls), in the “Mathematical Modeling & Statistics - Excel and HTML files developed for MAT 115 and statistics. Some files are appropriate for other courses” section from http://cfcc.edu/faculty/cmoore/IndexExcHtm.htm

The frequency distribution has classes and corresponding frequencies as in the table below.

 

Classes

Frequency

25-29

1

30-34

4

35-39

9

40-44

6

45-49

3

50-54

1