Probability-Combined-and-Conditional-probabilities -v2

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					              Sub: Statistics                                                                         Topic: Probability

              Question:

              Simple, Combined and Conditional probabilities.

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                   1.    If two events A and B are mutually exclusive, what does the special rule of addition
                         state?
                             a) P (A or B) = P (A) + P (B)
                             b) P (A and B) = P (A) + P (B)
                             c) P (A and/or B) = P (A) + P (B)
                             d) P (A or B) = P (A) - P (B)
                             e) None of the above

              Solution:

              The addition rule states that, P (A or B) = P (A) + P (B) - P (A and B)
              If two events A and B are mutually exclusive, then P (A and B) = 0
              then P (A or B) = P (A) + P (B)

              Correct answer is a) P (A or B) = P (A) + P (B).

                   2.    Which approach to probability is exemplified by the following formula?


                   Probability of an event happening = No. of times event occurred in the past

                                                                       Total number of observations

                        a)   Classical approach
                        b)   Relative frequency appr
				
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Description: Simple, Combined and Conditional probabilities.
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