HP 35s HP 35s scientific calculator - User Guide - Page 171
Statistical Operations, Display, Description, Mean One Variable., Weighted Mean Two Variables.
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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 12.5 9.25 12.0 10.0 8.5 Calculate the mean of the times. (Treat all data as x-values.) 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. 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) Number of Parts (y) $4.25 $4.60 $4.70 $4.10 250 800 900 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: Clears the statistics registers. Enters data; displays n. Statistical Operations 12-5