# The following tab

We may compute class marks (xi) as per the relation

Xi=

Now, let assumed mean (A) = 30

∑fi=80, ∑fidi=430

Mean=

= 30 + = 30+ 5.375

=35.38

It represents that on an average the age of patients admitted was 35.38 years. As we can observe that the maximum class frequency 23 belonging to class interval 35-45.

So, modal class= 35-45

Lower limit (l) of modal class =35

Frequency (f1) of the modal class=23

h=10,

Frequency (f0)of class preceding the modal class=21

Frequency (f2) of class succeeding the modal class =14

Now,

=

=35 + 1.81 =36.8years

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