AFCAT Model Paper 1

Given:
Average age of 25 boys is 78.4 lbs
Misread term = 69
Actual term = 96
Formula Used:
Average = (Sum of All observations)/(Total Number of observations)
Calculation:
Let sum of all observations be S

S

25

=78.4
⇒ S = 25 × 78.4 = 1960 lbs
Now, In this sum 96 is read as 69
Actual Sum = 1960 - 69 + 96 = 1987 lbs
Correct Average =

1987

25

=79.48 lbs
∴ The Correct Average Of the weight of Boys is 79.48 lbs