Twenty-five percent of the customers entering a grocery store between 5 P.M. and 7 P.M. use an express checkout. Consider five randomly selected customers, and let x denote the number among the five who use the express checkout. (a) What is p(5), that is, P(x = 5)? (Round the answer to five decimal places.) P(5) = (b) What is P(xs 1)? (Round the answer to five decimal places.) P(x s 1) = 0.6328 (c) What is P(2 s x)? (Round the answer to five decimal places. Hint: Make use of your computation in Part (b).) P(2 s x) = 0.3672 (d) What is P(x + 5)? (Round the answer to five decimal places.) P(x + 5) = 0.7363

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.