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purchasing survey asked purchasing professionals what sales traits impressed them most in a sales representative?

purchasing survey asked purchasing professionals what sales traits impressed them most in a sales representative? seventy-eight percent selected"thoroughness".forty percent responded"knowledge of your own product"the purchasing professionals were allowed to list more than one trait .suppose 27%of purchasing professionals listed both"thoroughness" and "knowledge of your own product"as sales traits that impressed them the most.a purchasing professional is randomly sampled.
a- what is the probability that the professional selected "thoroughness"or"knowledge of your product?

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