HP 33s User Manual
Page 149
Statistical
Operations
11–5
15.5
9.25
10.0
12.5
12.0
8.5
Calculate the mean of the times. (Treat all data as x–values.)
Keys:
Display:
Description:
{ c
{´}
Clears the statistics
registers.
15.5
)
Enters the first time.
9.25
10
12.5
12
8.5
)
Enters the remaining data;
six data points
accumulated.
|
{
º
}
º
¸
·
º
)
Calculates the mean time to
complete the process.
Example:
Weighted Mean (Two Variables).
A manufacturing company purchases a certain part four times a year. Last year's
purchases were:
Price per Part (x)
$4.25 $4.60 $4.70 $4.10
Number of Parts (y)
250 800 900 1000
Find the average price (weighted for the purchase quantity) for this part.
Remember to enter y, the weight (frequency), before x, the price.
Keys:
Display:
Description:
{ c
{´}
Clears the statistics
registers.
250
4.25
800
4.6
900
4.7
)
)
Enters data; displays n.
1000
4.1
8
)
)
Four data pairs
accumulated.
|
{
·
º
}
º
¸
·
º
)
Calculates the mean
price weighted for the
quantity purchased.