Casio FX-82AU PLUS Manuale Utente
26
Statistics
The button pressing sequence for statistics is on pages 12 to 15.
Remember!
· When you have finished entering the data you must press C to tell the calculator
that you have completed entering the scores.
· When you press SHIFT14 then 2 to bring up the value of the mean you
must press p to display the value. This is particularly important when you
proceed to find the second piece of information, e.g. the standard deviation.
proceed to find the second piece of information, e.g. the standard deviation.
Practise your statistics skills with the following questions.
1 Set your calculator to statistics and turn the frequency list off.
A Enter the scores 16, 19, 5, 11, 15, 12 and 9.
B Determine the value of the mean, ( x ) to 2 decimal places.
C What is the value of the standard deviation (
B Determine the value of the mean, ( x ) to 2 decimal places.
C What is the value of the standard deviation (
n
s
) to 3 decimal places?
D Determine the sample standard deviation (
1
n
s
-
) correct to 3 decimal
places.
2 Clear the data in the statistics list. The easiest way to clear the data is to turn the
calculator off. Alternatively, set the calculator to comp then back to statistics.
3 Set the calculator to statistics with the frequency on.
A Enter the data in the table into the calculator.
Scores
Frequency
5
4
6
9
7
15
8
11
9
7
10
4
B Determine the size of n, the number of scores.
C What is the value of the mean?
D Determine the size of the standard deviation correct to 3 decimal
C What is the value of the mean?
D Determine the size of the standard deviation correct to 3 decimal
places.
4 Determine the mean and standard deviation of the scores in the following table.
Scores
10
11
12
13
14
15
16
Frequencies 15
12
5
8
10
13
6
Answers
1B
1B
12.43
x =
,
4.338
n
s
=
,
1
n
s
-
= 4.685
3B n = 50 C
7.4
x =
D
1.356
n
s
=
4
12.7
x =
,
2.079
n
s
=
© Sue Thomson and Shriro Australia PTY Limited. This page may be photocopied for classroom use.