Comprehension Passage
The following table shows the number of residents of different age-groups in a colony. Read the table and answer the following questions.
| Age Group | 0-15 | 15-30 | 30-45 | 45-60 | 60-75 | 75-90 |
| Number of Residents | 50 | 60 | 80 | 60 | 30 | 20 |
What is the mean age of the residents? (to the nearest one decimal place of the year)
1
40.6
2
38.5
3
45.5
4
42.5