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Probability 20 Online
OpenStudy (anonymous):

Please Help!! I will medal you! PicnicTech markets 3 versions of its Picnic Egg Boxes: the Golden Deluxe, containing 3 gold eggs and 1 plain egg; the Regular, containing 2 gold and 2 plain; and the EconoLunch, containing just 1 gold egg and 3 plain ones. The corner store has 3 Golden Deluxes on sale, 2 Regulars, and 5 EconoLunches. This is all shown in the tree diagram below.You buy a Picnic Egg Box at random and select an egg from it at random. The egg is gold! Use a probability tree diagram to calculate the probability that the box you bought was a Regular.

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