Question
Average age of the people of a country is shown in the following table:
|
Age (years) |
10-20 |
20-30 |
30-40 |
40-50 |
50-60 |
|
People (000) |
30 |
32 |
15 |
12 |
9 |
Find out mean age by direct method
Solution
|
Age |
People (000) f |
M.V. (X) |
fx |
|
10-20 20-30 30-40 40-50 50-60 |
30 32 15 12 9 |
15 25 35 45 55 |
450 800 525 540 495 |
|
Σ f =98 |
Σ fx = 2810 |
