How do you solve this?

The following frequency table relates the weekly sales of bicycles at a given store over a 42-week period.value01234567frequency367108521(a) in how many weeks were at least 2 bikes sold? (b) in how many weeks were at least 5 bikes sold? (c) in how many weeks were an even number of bikes sold?

Does the point (1, sqrt 7) lie on circle shown.

Hi, can anyone show me how to do this problem? 100 points for this. in advance