AND / OR Probability

prob

A nice differentiated worksheet on the AND / OR rules of probability

and_or

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5 thoughts on “AND / OR Probability

  1. I looked at the HARD section and as it’s a long time ago that I was playing with this stuff it took a little while before concluding “can’t be done’. I checked the AND/OR document, it’s RUBBISH.
    prob(A) =1/2, prob(B)=3/4, so prob(A or B) = 5/4.
    Was this a test?

  2. Events have to be mutually exclusive for the OR rule to apply, and independent for the AND rule to apply. I suppose there could be an additional sentence in the HARD section asking to assume independence for AND rule and mutually exclusive for OR rule.

    edit: I’ve added the sentence!

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