# A supermarket has four checkouts A, B, C, and D. Management checks the weighing devices

**Chapter 23, Problem 3**

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A supermarket has four checkouts A, B, C, and D. Management checks the weighing devices at each checkout. If a weighing device is accurate a Y is recorded; otherwise, N is recorded. The randomvariable being considered is the number of weighing devices which are accurate.a Suppose X is the random variable. What values can X have?b Tabulate the possible outcomes and the corresponding values for X.c Describe, using X, the events of:i exactly two devices being accurate ii at least two devices being accurate.

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