Statistical Operations 12-5
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):
Calculate the mean of the times. (Treat all data as x–values.)
Example: Weighted Mean (Two Variables).
A manufacturing company purchases a certain part four times a year. Last year's
purchases were:
Find the average price (weighted for the purchase quantity) for this part. Remember
to enter y, the weight (frequency), before x, the price.
15.5 9.25 10.0
12.5 12.0 8.5
Keys: Display: Description:
()
Clears the statistics registers.
Enters the first time.
Enters the remaining data; six
data points accumulated.
()
Calculates the mean time to
complete the process.
Price per Part (x)
$4.25 $4.60 $4.70 $4.10
Number of Parts (y)
250 800 900 1000
Keys: Display: Description:
()
Clears the statistics
registers.
Enters data; displays n.
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