Statistics

I have two boxes with balls; box #1 and box #2. Box #1 has 3 red balls and 2 blue balls.Box #2 has 7 red balls and 3 blue balls. what is the probability that if a red ball is picked, it is from box #1

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  1. P(Box1/Red Ball) = P(Box1+red Ball)/P(R) = (1/2 . 3/5)/ (1/2 . 3/5 + 1/2 . 7/10 ) = 6/13

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