Operation Manual

78 Section 6: Statistics Functions
To find the average workweek and sales of this sample:
Standard Deviation
Pressing gv calculates the standard deviation of the x-values (s
x
) and of the
y-values (s
y
). (The standard deviation of a set of data is a measure of the
dispersion around the mean.) The standard deviation of the x-values appears in
the display after v is pressed; to display the standard deviation of the y-values,
press ~.
Salesperson Hours/Week Hours/Week
132$17,000
240$25,000
345$26,000
440$20,000
538$21,000
650$28,000
735$15,000
Keystrokes Display
fCLEAR²
00.00
Clears statistics registers.
32\
17000_
32.00
1.00
First entry.
40\
25000_
40.00
2.00
Second entry.
45\
26000_
45.00
3.00
Third entry.
40\
20000_
40.00
4.00
Fourth entry.
38\
21000_
38.00
5.00
Fifth entry.
50\
28000_
50.00
6.00
Sixth entry.
35\
15000_
35.00
7.00
Total number of entries in the
sample.
gÖ
21,714.29
Mean dollar sales per month ( ).
~
40.00
Mean workweek in hours ( ).
x
y