Weighted Mean and Grouped Standard Deviation
Data in one list (x) can be weighted or grouped (by frequency) by data in another list (y). To find the mean of weighted data and the standard deviation of grouped data:
1.Enter the data
2.Enter the corresponding weights or
3.From the SUM menu, press to display a menu of
4.Press the menu key for the list of
5.Now select the list with the weights (or frequencies) (y).
6.To calculate the weighted mean, press .
7.To calculate the grouped standard deviation, press .
Example: Weighted Mean. A survey of 266
Create two SUM lists. The first, called RENT, should contain the numbers 200, 205, 210, and 216, in that order. The second can be unnamed and should contain the numbers 54, 32, 88, and 92, in that order.
Keys:Display:Description:
@c | | Clears current list or gets a | |||
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200 I | | ||||
205 I | |
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210 I | |
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138 10: Running Total and Statistics
File name :