HP -28S Manual page 268

~Xy
(Sum of Products of x and
V)
Calculate I,xy, where the x's and y's are corresponding elements of C
1
and C
2
(the columns specified by the first and second parameters in
I,PAR).
Arguments
Program
.
:~:
1 2
I:GET
I
ENTER
I
c:J
~Xy
I
STO
I
Results
1: ~xy
Comments
Begin the program .
Specify C
1
and C
2 .
Extract I,xy.
End the program.
Put the program on the stack.
Store the program as I,XY.
Example. Calculate I,X2, I,Y2, and I,XY for the following statistics
data:
18 12
4 7
3 2
11 1
31 48
20 17
28: Programming Examples 267