The accompanying data came from a study of collusion in bidding within the construction industry. (View Pic Below)   (a) What proportion of the contracts involved at most five bidders? At least five bidders? (Round your answers to four decimal places.)   at most five bidders   at least five bidders   (b) What proportion of the contracts involved between five and 10 bidders, inclusive? Strictly between five and 10 bidders? (Round your answers to four decimal places.)

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