Grouped Standard Deviation - HP 35s User Manual

Keys:
(In RPN mode)
S


D

Thus, we would expect that only about 1 percent of the students would do better
than score 90.
Keys:
(In RPN mode)
I




Grouped Standard Deviation

The standard deviation of grouped data, S
points x , x , ... , x
1 2
16-18
Statistics Programs
Display:






value


Display:








, occurring at positive integer frequencies f
n
S
xg
Description:
Starts the initialization routine.
Stores 55 for the mean.
Stores 15.3 for the standard deviation.
Starts the distribution program and
prompts for X.
Enters 90 for X and calculates Q(X).
Description:
Starts the inverse routine.
Stores 0.1 (10 percent) in Q(X) and
calculates X.
Resumes the inverse routine.
Stores 0.8 (100 percent minus 20
percent) in Q(X) and calculates X.
, is the standard deviation of data
xy
∑
( x ) f
∑
2 i
x f
∑
i i
f
i
∑
( ) f 1
i
, f , ... , f
1 2 n
2
i
.