Q. 26 4.2( 5 Votes )

Find the mean age from the following frequency distribution:

Answer :

We will find the mean age using step - deviation method, where A = Assumed mean and h = length of class interval.

Here, let A = 42 and h = 5

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 = 42, h = 5, Σfi = 70 & Σfiui = - 37

mean is given by

Thus, mean age is 544 years.

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