# Mean, Standard Deviations, And Summation Statistics - HP 10bII+ User Manual

Financial calculator.

## Mean, Standard Deviations, and Summation Statistics

You can calculate the mean ( ), sample standard deviation (S
σ
deviation (
), and summation statistics, n,
x
calculate the mean, sample standard deviation, and population standard deviation of the y-
data and the summation statistics
Example 2
A yacht captain wants to determine how long it takes to change a sail. She randomly chooses
six members of her crew, observes them as they carry out the sail change, and records the
numbers of minutes required: 4.5, 4, 2, 3.25, 3.5, 3.75. Calculate the mean and sample
standard deviation of the times. Also, calculate the root mean square, using the formula,
x
2
n ⁄
.
Table 12-7 Example calculating mean, standard deviation, and summation statistics
Keys
\t
Y7V¡
D7GV¡
D7V¡
D7jV¡
\k
\h
]l
a][
4\B
120
Statistical Calculations
x
, and x
Σ
x
2
, and
Σ
Σ
Σ
y,
y
xy.
Display
STAT CLR
(message flashes briefly,
then disappears)
1.00
2.00
3.00
4.00
5.00
6.00
3.50
0.85
77.13
6.00
3.59
), and population standard
x
2
of x-data. For x,y data, you can also
Σ
Description
Clears statistics memory.
Enters first time.
Enters second time.
Enters third time.
Enters fourth time.
Enters fifth time.
Enters sixth time
Calculates the mean.
Calculates the sample standard
deviation.
2
Σx
Displays
.
Displays n.
Calculates the root mean
square.  