The mean of first 10 observations is 18.if one of the observation 20 is noted instead of 35.find the correct mean
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Mean of 1st 10 observations = 18
Sum of 1st 10 observations = 18×10=180
Sum of 9 observations= 180-20=160
Correct sum of 10 observations= 160+35=195
Correct mean= 195÷10=19.5
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