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CBSE Class 12-science Answered

An instructor has a test bank consisting of 300 easy true/false questions, 200 difficult questions, 500 easy multiple choice questions and 400 difficult multiple choice questions. if a question is selected at random from the test bank, what is the probability that it will be an easy question given that it is multiple choice question.
Asked by jaspreet singh | 24 Jan, 2011, 08:52: PM
answered-by-expert Expert Answer
Dear Student,
 
We know that
 
 
Therefore,
 
P(Question is Easy / Question is Multiple Choice)
= P(Question is Easy Multiple Choice)/P(Question is Multiple Choice)
 
=> P(Question is Easy / Question is Multiple Choice) =
 
 
Regards Topperlearning.
Answered by | 27 Jan, 2011, 12:12: AM

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