# In the first proo

To find : the average number of misprints per page.
Solution :
Use the shortcut method to find the mean of given data.
For that,
Let the assumed mean be (A) = 2,
The deviation of values xi from assumed mean be di = xi – A.
Now to find the mean:
First multiply the frequencies in column (ii) with the value of deviations in column (iii) as fidi.
Construct the table using above information.
The table is as follows:

Now add the sum of all entries in column (iii) to obtain
and the sum of all frequencies in the column (ii) to obtain
So,
Average number of misprints per day = A +

where, N = total number of observations

⇒ Mean = 2 +
Mean =

Mean =
Mean = 0.73

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses