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94 Section 6: Statistics Functions
File name: hp 12c pt_user's guide_English_HDPMF123E27 Page: 94 of 275
Printed Date: 2005/8/1 Dimension: 14.8 cm x 21 cm
The table below shows where the accumulated statistics are stored.
Register Statistic
R
1
(and display) n: number of data pairs accumulated.
R
2
Σx: summation of x-values.
R
3
Σx
2
: summation of squares of x-values.
R
4
Σy: summation of y-values.
R
5
Σy
2
summation of squares of y-values.
R
6
Σxy: summation of products of x-values and y-values.
Correcting Accumulated Statistics
If you discover you have entered data incorrectly, the accumulated statistics can
easily be corrected. Simply key in the incorrect data point or data pair again as if
it were new, but press
g^
instead of
_
. Then enter the correct data point or
data pair and press
_
.
Mean
Pressing
gÖ
calculates the means (arithmetic averages) of the x-values (
x
) and
of the y-values (
y
). The mean of the x-values appears in the display after
gÖ
is
pressed; to display the mean of the y-values, press
~
.
Example:
A survey of seven salespersons in your company reveals that they work
the following hours a week and sell the following dollar volumes each month. How
many hours does the average salesperson work each week
?
How much does the
average salesperson sell each month
?