The following frequency table relates the weekly sales of bicycles at a given store over a 42-week period.

Value

0

1

2

3

4

5

6

7

Frequency

3

6

7

10

8

5

2

1

(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?