mean of 35 obversation was found to be 78.4 but later it was found that 86 was misrigted for 68 find the correct mean
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Mean = sum of observations/ total no: of observations
∴ Sum of observations = Mean × Total no: of observations.
= 35 ×78.4 =2744
As 86 is the correct no: and 68 is the wrong , 86 should be added to the sum of observations and 68 should be subtracted.
New sum of observations = 2744+ 86 - 68 = 2762
Mean = sum of observations/ total no: of observations
= 2762 ÷ 35 = 78.9142857
Plz mark brainliest .....
∴ Sum of observations = Mean × Total no: of observations.
= 35 ×78.4 =2744
As 86 is the correct no: and 68 is the wrong , 86 should be added to the sum of observations and 68 should be subtracted.
New sum of observations = 2744+ 86 - 68 = 2762
Mean = sum of observations/ total no: of observations
= 2762 ÷ 35 = 78.9142857
Plz mark brainliest .....
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