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Does anyone have a formula for these type of problems?
30% of all Girl Scout cookies sold are Thin Mints. If we select 9 boxes of cookies at random, what is the probability at most 5 of them are Thin Mints?
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1 Answer
Is this the exact wording of the problem?
It's not clear if the selection of each box is with or without replacement-are you drawing 9 boxes all at once, or are you choosing one at a time and then putting the box back before drawing again?
Also, it's unclear what the probability is of *choosing* a box of Thin Mints. Knowing 30% of boxes *sold* are Thin Mints doesn't tell you anything about how many Thin Mints boxes are present in the "population" of cookie boxes you are drawing from!
