Question

Mean of 10 numbers is 30. later on it was observed that numbers 15,23 are wrongly taken as 51,32. the correct mean is

Answer 1

I think new mean is 25.5

Answer 2

The correct mean is $25.5$.

The formula of mean :

Mean = Total sum of observations / Number of observations

Explanation :

Total sum $= 10*30 = 300$.

1. $51 +32 = 83$
2. $15 + 23 = 38$

Now, $83 - 38 = 45$.

$300 - 45 = 255\\255 / 10 = 25.5$

Therefore, the correct mean is $25.5$.

#SPJ2