Question

The mean of 40 observations was 46. Later on it was found that an observation 38 was wrongly taken as 33. find the corrected value of mean, O 40.23 O 42.36 O 46.12 O 51.23?

Answer 1

Answer:

O 46.12

Step-by-step explanation:

Since the observation 38 was wrongly taken 33, 38 is the correct observation.  So, we need to add 5.

Sum of all observations = 40x46

=1840

Since 5 was added,  sum of correct observations = 1840 + 5

= 1845

x bar = sigma fixi / sigma fi

Mean = sum of all observations / Number of observations

1845/40

=46.125