Q. 273.5( 6 Votes )
The following table shows the age distribution of patients of malaria in a village during a particular month:
Find the average age of the patients.
Answer :
We will find the average age using step - deviation method, where A = Assumed mean and h = length of class interval.
Here, let A = 29.5 and h = 10
Since, the class intervals are inclusive type, we’ll first convert it into exclusive type by extending the class interval from both the ends.
We have got
A = 29.5, h = 10, Σfi = 80 & Σfiui = 43
∵ mean is given by
⇒ 
⇒ 
Thus, mean age is 34.88 years.
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