Calculating the mean and standard deviation on a calculator
MAS1403: Quantitative methods for Business Management
Tutorial: Week 3
Calculating the mean and standard deviation on a calculator
The following commands show how to calculate the mean and standard deviation by using the STAT
mode on a CASIO fx-83 GT PLUS (the procedure is similar for other CASIO models).
?
Enter the data
? Press Mode (top right corner);
? then press 2 for STAT mode;
? then press 1 corresponding to the 1-Var option.
This should bring up a table with one column headed x and the numbers 1,2,3 down the lefthand side. To enter each data point, input its value followed by the = sign. For example, if the
data are
16, 52, 0, 6, 10, 0, 21
enter:
? 16 = 52 = 0 = 6 = 10 = 0 = 21
? To finish entering the data press the AC button.
?
Calculating numerical summaries
? Press SHIFT followed by 1 to select STAT mode;
? then select the Var option which is number 4 on the fx-83 GT PLUS but number 5 on
some older models;
? there should be four options; 1 is the sample size n; 2 is the sample mean x?; and 4 is the
sample standard deviation s;
? for example, press 4 (corresponding to sx for the sample standard deviation), then press
= to get the answer.
Note that you need to repeat the process under ? for each numerical summary.
You should get 15 for the mean, and 18.083 (to three decimal places) for the standard deviation; these
match up with what we calculated in Examples 1 and 5 in Chapter 3.
1
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