Twenty percent of the customers of a grocery store use express checkout. Consider five randomly selected customers, and let x denote the number among the five who use the express checkout. (Round your answer to three decimal places.) (a) Calculate p(1), that is, P(x = 1). p(1) =   (b) Calculate P(x ≤ 1). P(x ≤ 1) =   (c) Calculate P(2 ≤ x). (Hint: Make use of your answer from part (b).) P(2 ≤ x) =

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