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Statistical Operations 11–5
File name 32sii-Manual-E-0424
Printed Date : 2003/4/24 Size : 17.7 x 25.2 cm
y–values as weights or frequencies. The weights can be integers or
non–integers.
Example:
Mean (One Variable).
Production supervisor May Kitt wants to determine the average time that a
certain process takes. She randomly picks six people, observes each one as
he or she carries out the process, and records the time required (in minutes):
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:
z
b
{
´
}
Clears the statistics registers.
15.5
6
)
Enters the first time.
9.25
6
10
6
12.5
6
12
6
8.5
6
)
Enters the remaining data;
six data points accumulated.
{
/
{
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 S4.10
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:
z
b
{
´
}
Clears the statistics registers.
250
4.25
6
800
4.6
6
900
4.7
6
)
)
)
Enters data; displays n.