Mathematics, 04.05.2021 02:10 rodderickjack

A company advertises that its batteries still have a 80% chance of working when they are 10 years old. You find a pack of 20 batteries in a drawer that are 10 years old, so you start to test them to see if they work. What is the probability that you start with 4 good batteries and then get a defective battery?

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A company advertises that its batteries still have a 80% chance of working when they are 10 years ol...