Mean and Standard Deviation on a TI86
Here's how to compute some basic statistics on your TI86:
 Press the [2nd][STAT] button. You should see
something
like this on your screen:
 Press the [CALC] button (that is, press the
button on
your
calculator below the box labeled "CALC" on the screen). Now your screen
should look something like:
 Press [OneVa] to indicate that you want to CALCulate
OneVariable
statistics. You should now see:
 Now to tell the calculator the list of numbers for which you want
to
compute
those statistics, press [2nd][LIST] to get:
and use the braces now visible in the menu to type {1,2,2,3,3,3,5,7}
(or whatever your actual list is):
 When you press [ENTER], many statistics will
appear:The =3.25
tells you the average of your list, and the x=1.785...
tells
you the standard deviation of your list. If you scroll down, you will
see n=8,
telling you there are 8 data items, a good check of your typing.
Short summary:
 To compute the mean and standard deviation of a list, say
{1,3,6,6,10},
type OneVar {1,3,6,6,10}
 Get OneVa(r) on the [2nd][STAT][CALC]
menu.
 Get the braces "{" and "}" from the [2nd][LIST]
menu.
 and x
are the mean and standard deviation, respectively. n
is
the number of data items entered.
Test yourself:
Try to get the mean and standard deviation of 37.75, 38,
37,
38.5, and 37.5. You should get a mean of 37.75 and a standard deviation
of 0.5.
Bonus Topics:
Frequency tables:
If you have many repeated data items, such as a frequency table:
data item 
frequency 
3

4

8

5

1

7

5

1

...meaning that your list contains four 3's, five 8's, etc., then
you
need not type all the repeated data, but can input frequencies directly
as shown below. The first list entries are the data items, the second
list
entries are the respective frequencies. Don't forget the COMMA
between
the two lists, or your results will be completely wrong.
When you press [ENTER], you get
and scrolling down shows which
confirms (with n=17) that we have really entered 17
data
items.
Help with medians and other bonuses:
After computing OneVariable statistics for a particular list, scroll
down
a little farther and see what nice surprises await you.
Last Modified January 31, 2000.
Prof.
Janeba's Home Page  Send comments or questions to: mjanebawillamette.edu
Department
of Mathematics  Willamette
University Home Page