I just need help with a and b please :)

The accompanying data came from a study of collusion in bidding within the construction industry. No. Bidders No. Contracts 2 8 3 20 4 24 5 l? 6 12 7 8 8 5 9 6 ll] 2 l 1 l lg USE SALT (a) What proportion of the contracts involved at most ve bidders? At least ve bidders? (Round your answers to four decimal places.) at most ve bidders x at least five bidders X (b) What proportion of the contracts involved between ve and 10 bidders, inclusive? Strictly between five and 10 bidders? {Round your answers to four decimal places.) between ve and 10 bidders, inclusive X strictly between ve and 10 bidders X