Answers

2016-03-09T20:26:45+05:30
Sum = 30*12= 360 So 360-47+74= 313+74=387 So new sum is 387 Mean = 387/12 = 32.25
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2016-03-09T21:09:02+05:30
incorrect mean = 30× 12=360. new mean = 360 - 74 + 47= 333. correct mean =333÷30=11.1
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