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A person randomly selects one of four envelopes. Each envelope contains a check that the person...

A person randomly selects one of four envelopes. Each envelope contains a check that the person gets to keep.​ However, before the person can select an​ envelope, he or she must pay ​$10 to play. Determine the​ person's expectation if two of the envelopes contain ​$5 checks and two of the envelopes contain ​$20 checks.

Math   Statistics-And-Probability   
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