1-Var Stats

1:1-Var Stats summary statistics for a frequency distribution.

 

Clear the home screen.

Enter the class midpoints 10, 13, 16 19, 22, and 25 into L1. 

Enter the frequencies 3, 2, 5, 3, 6, and 4 into L2. 

 

 

Press STAT, right arrow to CALC. 

 

Press ENTER.

With class midpoints in L1 and corresponding frequencies in L2, press

 

Press ENTER to get the results. Mean = 18.5, ∑x = ∑fx = 425, ∑x2 = ∑fx2 = 8405, and n = ∑f = 23.

All of these values can be put into the formula to get the standard deviation, sx = s = 5.0.