Math, asked by raeeshjoshi, 9 months ago

The mean of 25 observations is 80 and the mean of another 55 observations is 60. Determine the mean of whole sets of observations.

Answers

Answered by Nivedita4209

6

Answer:

Number of observations= 75

Mean=27

Sum of observations=75×27

Wrong value=43, Correct value=53

∴Correct sum=75×27−43+53=75×27+10

Correct mean=7575×27+10=27+7510=27.133

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