The following data came from a study of collusion in bidding within the construction industry: construction collusion bidders number of contracts 2 7 3 20 4 26 5 16 6 11 7 9 8 6 9 8 10 3 11 2 the first column represents number of bidders and the second represents number of contracts where there were that number of bidders. a) what is the relative frequency of the contracts involving at most five bidders? give your answer in decimals and round to 3 decimal places.