Mean And Standard Deviation - HP 46 Operating Manual

Mean and Standard Deviation
To calculate the mean and standard deviationf of a group of numbers,
first total the numbers as described earlier by keying in each value and
pressing > +. When all values are totaled, press mmm x 4 .The following
information is printed:
e number of entries (#)
e standard deviation (&)
e mean (x)
The standard deviation is placed in Y. The mean is placed in X. The
previous x and y values are erased.
EXAMPLE
A. In a recent survey to determine the average age of the 10 wealthiest
people in the U.S., the following data was obtained:
62 84 47 58 68 60 62 59 71 73
Of the ages given, what is the mean? The standard deviation?
Press:- CLEAR
CLR 62000 Z"'
4 84000 Z"'
62 84 47 - 47.00 I+
58.00 I+
8 o8 o0 e 0
$2.00 I+
62+ 59 = 71 59.00 I+
7100 i+
73.00 Z+
73- B 10,00 o
' 10.10 A9
64440 X O
1\ /E 2 _1/n (Zx)?
'f'The formula used for standard deviation is: A = cx niex 1/n (2x)
n_
28