In order to know the public's satisfaction with B2 bus, which was implemented on June 10, 2008, computer random sampling method was adopted.

(1) As can be seen from Figure 1, among the residents surveyed,

2 1 ~ 30 years old population accounts for 39% of the total, accounting for the largest proportion.

Therefore, the number of people aged 2 1 ~ 30 is the largest;

(2) It is understood that among the 300 people surveyed, 83% are satisfied with B2 bus.

Therefore, the number of people who are satisfied with B2 bus is 300×83%=249.

Satisfied people = the sum of satisfied people of all ages,

So 2 1-30 years old = 249-41-50-40-18-7 = 93 (person);

This can be used to complete Figure 2, as shown in the following figure:

(3)√ The satisfaction rate of a certain age group = the number of satisfied people in that age group ÷ the number of sampled people in that age group × 100%.

∴2 1-30, the satisfaction of the elderly is 93 ∴ (300× 39% )× 100% ≈ 79%.

The satisfaction rate of 4 1-50 years old is 40 ÷ (300×15% )×100% ≈ 89%.

∴ ∴2 1-30/-satisfaction rate over 30 years old < 4 1-50 years old.