Question

In a hospital there are 56 TB patients. The patients are grouped with respect to their ages.

Class Boundaries

Frequency

5-10

8

10-15

9

15-20

15

20-25

10

25-30

8

30-35

6



Find the average (mean) age of the TB patients.

Answer 1

Table:

Class Boundaries Frequency

5-10 8

10-15 9

15-20 15

20-25 10

25-30 8

30-35 6
----------
total 56

Average =

[5+10]/2*8+[10+15]/2*9+[15+20]/2*15+[20+25]/2*10+[25+30]/2*8+[30+35]/2*6
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56

That is 1075 / 56 = 19.2

Answer: 19