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Confused help

 May 23, 2017
 #1
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The probability that Ann will have a test on Wednesday and that she will pass that test is (0.9) x (0.8)  =  0.72.

The probability that Ann will not pass the test on Wednesday (that is, either that there is no test on Wednesday or, if there is a test on Wednesday, she will not pass it) is 1.00 - 0.72  =  0.28 

 May 23, 2017

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