Consider the following frequency distribution for grouped data:

Class
Frequency
Midpoint
5.5 - 10.5
1
8
10.5 - 15.5
2
13
15.5 - 20.5
3
18
20.5 - 25.5
5
23
25.5 - 30.5
4
28
30.5 - 30.5
3
33
30.5 - 40.5
2
38

The ONE VARIABLE STATISTICS option provides summary information on a frequency distribution of grouped data. Specifically, the following information is provided:

the mean or average
the sum of all data
the sum of the squares
the sample standard deviation
the population standard deviation
the number of elements
the minimum element
the first quartile
the median of the data
the third quartile
the maximum element

First enter the midpoints into and frequencies into . To learn how to enter data into a list, go to Making a Table . Once the data are entered, the screen should appear as shown below:

Next, press STAT and then press the RIGHT ARROW to get to the CALC menu. Select 1-Var STATS by pressing ENTER. Press 2nd 1 to type and 2nd 2 to type .

 

After pressing ENTER again, the final screen should appear as shown below:

The located at the bottom left of the screen indicates that there are more entries to be displayed. By pressing the DOWN ARROW key, the other ONE VARIABLE STATISTICS are displayed.

 



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