HP HP-20S - Weighted Mean

Weighted Mean
X1, X2, + o X, Occurring with weights y;, y,.. 0, ¥y
1. Use to enter the data as x,y-pairs. The y-values are
the weights of the x-values.
2. Press [*] [(Zw].
Example: Weighted Mean. Your manufacturing company purchases
a certain part four times a year. Last year’s purchases were:
Price/Part $4.25 $4.60 $4.70 $4.10
Number of 250 800 900 1000
Parts
Calculate the average price per part.
Keys: Display: Description:
(] 0.0000 Clears the statistical
registers.
4.25 250
4.6 800
4.7 900
4.1 1000 4.0000 Enters the data and
their weights.
(] 4.4314 Calculates weighted
mean (average part
price).
5: Statistical Calculations 59