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Mathematics 18 Online
OpenStudy (anonymous):

A box contains 100 envelopes. Eleven envelopes contain $10 each, eleven contain $5 each, four are "unlucky," and the rest are empty. A player draws an envelope from the box and keeps whatever is in it. If a person draws an unlucky envelope, however, he must pay $50. What is the expectation of a person playing this game? (Round your answer to the nearest cent.)

OpenStudy (triciaal):

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