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A truefalse test consists of 15 items. (b) What is the probability that Chris gets 80% or more for the test? (c) If it is a 25 item truefalse test, would you think it is easier or more difficulty for Chris to get 80% or more? 
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A truefalse test consists of 15 items. (a) If Chris does not study at all and guesses each and every item in the test, describe the probability model for the number of correct guesses. (b) What is the probability that Chris gets 
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A truefalse test consists of 10 items. What is the probability that Chris gets 80% or more for the test? 
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the question is: If you know that 4 of the 10 items on a truefalse test are false, how many different ways could you select 4 items to mark as being false? I think the answer is 10P4=10*9*8*7/4*3*2*1=5040/24=210 ways 
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