1Var Stats 
1:1Var 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, ∑x^{2} = ∑fx^{2} = 8405, and n = ∑f
= 23. All of these values can be put into the formula to get the
standard deviation, s_{x} = s = 5.0. 


