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press[ [], the mean of the values of x is calculated using the
data in storage registers R, (n) and R;(2x) and the formula:
|
n
;:HE
X
1=1
The easiest way to accumulate the required data in the appli-
cable registers is through the use of the
key as described
above. However, the required data may also be stored directly
in storage registers R, (1) and R, (3x), if desired.
Example: A survey found ten of the wealthiest persons in the
United States to have the following ages:
62
84
47
58
68
60
62
59
71
73
To find the average (mean) age of this sample of wealthy
persons:
Press
Display
in years.
Standard Deviation
The standard deviation (a measure of dispersion around the
mean) is calculated using data in the applicable storage registers
and the[](standard deviation) key. Pressing[ ! [S]uses the data
in registers R, (1), Rg (2x?), and R, (2 x) to calculate the standard
deviation according to the formula:
(2x)?
n
n-1
For example, to obtain the sample deviation in the above
problem:
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