Texas Instruments TI-95 User Manual page 77

Performing 1-Variable Statistics Calculations
After entering data into the statistics registers, you can
calculate the mean and standard deviation of the data values.
You can also calculate intermediate sums or check the data
in the registers. (An example of these calculations begins on
page 3-8.)
Calculating
the Mean
Calculating
the Standard
Deviation
<MN> key sequencecalculates the mean
(average)of the data values according to the following
equation.
=x
MN= a
<s) key sequencecalculates the sample (n—-1
weighted) standarddeviation according to the following
equation.
s -\) B#-
ae n(n-1)
[INV] <s> key sequencecalculates the
population (n weighted) standard deviation according to
the following equation.
3-6 Statistics Operations