TI-83 Instructions
Computing a Weighted Mean
- Enter the data values (x)
into list L1.
- Enter the weights (w)
into list L2.
Method
1
- Press 2nd L1.
- Type × (multiply).
- Press 2nd L2.
- Press STO.
- Press 2nd L3.
- Press ENTER. This stores the products xw in
list L3.
- Enter the expression sum(L3) in the display. (See Computing a Mean.)
- Type ÷ (divide).
- Enter the expression sum(L2) in the display.
- Press ENTER. The weighted mean is displayed.
Method
2
- Press STAT.
- Use the arrow keys to
select the CALC menu title.
- Select item #1, 1-Var
Stats.
- Press 2nd
L1.
- Enter a comma.
- Press 2nd
L2.
- Press ENTER. A list of statistics appears. The first one is the weighted mean.