(Answered) Can you show me how to establish this formula in excel

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Can you show me how to establish this formula in excel, along with the answer?

A small grocery store is considering installing an express checkout line. Let X be the number of customers in the regular checkout line. Note that these numbers include the customers being served, if any. The probability distribution of X is given in the table below.

x 0 1 2 3

P(X=x) 0.20 0.30 0.25 0.25

Find the probability that at most one customer is in the regular checkout line.

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