midreview-F09

midreview-F09 - ISMT 111 BUSINESS STATISTICS REVIEW FOR...

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1 ISMT 111 B USINESS S TATISTICS R EVIEW FOR M IDTERM created by Andrew Yam Question 2 in Midterm 2005 An urn has two coins, where each has two faces. The probabilities of landing heads (head faces up) for the two coins are: Coin 1: lands heads with probability ½ (coin has head on one side and tail on the other side) Coin 2: lands heads with probability 1 (coin has heads on both sides) You select a coin at random (each coin has probability 1/2 of being selected). Then you toss the selected coin, a) What is the probability that the tossed coin lands head?
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2 Answer a) ( 29 head P ( 29 ( 29
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midreview-F09 - ISMT 111 BUSINESS STATISTICS REVIEW FOR...

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