Mean; Standard Deviation - HP -10C Owner's Handbook Manual

Mean

The ' function computes the arithmetic mean (average) of the x-and y-values
using the accumulated statistics in registers R
press ´':
1. The contents of the stack registers lift in the same way as if you keyed
in two numbers in sequence. (The mean of x is simultaneously copied
into the X-register as the mean of y is copied into the Y-register.)
2. The mean of the x-values (
accumulated in R
calculated using the data accumulated in registers R
The formulas used are shown below:
Example: From the 5-year statistical data you accumulated (and corrected) in
the preceding examples, calculate the average coal production and electrical
output for the entire period.
Keystrokes
´'
®
Retain these statistics in the calculator for use in the next example.

Standard Deviation

Pressing ´S computes the standard deviation (a measure of dispersion
around the mean) of the accumulated statistical data. The formulas used by the
Section 3: Numeric Functions
x
(∑x) and R (n). The mean of the y-values (
1 0
=
x
=
y
Display
6.135
1.832
and R , respectively. When you
1 3
) is calculated using the statistics
∑
x
n
∑
y
n
Average electrical output
(average of X-register
inputs) for the 5-year
period.
Average coal production
(average Y-register
inputs) for the 5-year
period.
43
) is
y
(∑y) and R (n).
3 0