two bad and one good
.12 * .12 * .88 ... per pack ... 300 packs
36 is too high
There is an 88% chance that a Dumbo battery is not faulty.Dean orders 300 triple packs of Dumbo batteries for his shop.Find an estimate for the number of pack that contain exactly 2 faulty batteries...
I m thinking about 36 but I m not sure.
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