Table of Contents
Advertisement
Weighted Mean
The following procedure calculates the weighted mean of data points
X1, Xy, ...X, occurring with weights vy, y,, ...y,. The weights can be
integer or non-integer values.
1. Use
to enter the data as x,y-pairs. The y-values are the
weights of the x-values.
2. Press (STAT] {x=,#} {=w}.
Example: Weighted Mean. Your manufacturing company purchases
a certain part four times a year. Last year's purchases were:
Price per part
$4.25
$4.60
$4.70
$4.10
Number of Parts
250
800
900
1000
Calculate the weighted mean of the price data.
Keys:
Display:
Description:
B(cLEAR] {=}
Clears the statistical
registers.
4.25
250
Enters the data and
4.6
800
their weights.
4.7
900
4.1
1000
n=4.0000
{z,5} {=w}
*w=4.4314
Calculates weighted
mean.
68
Statistical Calculations
Advertisement
Table of Contents
