The mean of 10 observations was calculated as 40. It was detected on rechecking that the value of 40 was wrongly copied as 10. Find the correct mean.
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Step-by-step explanation:
=》Mean = (Sum of all observations)/(Number of observations)
=》or, 40 = (Sum of all observations)/10
=》So, sum of all observations = 400
=》But this is incorrect sum, since one observation was copied wrongly.
=》 So, correct sum = Incorrect sum – Incorrect observation + correct observation
=》400 – 15 + 45
=》430
=》 Correct Mean = Correct Sum/ Number of observations
=》 430/10
=》43
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