Question: A sample of wind generators was tested for power output when the wind speed was 30 km/h. The following table gives the powers produced (to

A sample of wind generators was tested for power output when the wind speed was 30 km/h. The following table gives the powers produced (to the nearest 10 W) and the number of generators for each power value.

Power (W) No. Generators Power (W) No. Generators 650 660 670 680

Find the mean.

Power (W) No. Generators Power (W) No. Generators 650 660 670 680 690 3 2 7 12 27 700 710 720 34 15 16 730 5

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