Q. 74.5( 2 Votes )

In the first proo

Answer :

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

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