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In a group of 10 ​batteries, 3 are dead. You choose 2 batteries at random. ​...

In a group of 10 ​batteries, 3 are dead. You choose 2 batteries at random. ​

a) Create a probability model for the number of good batteries you get.

​b) What's the expected number of good ones you​ get?

​c) What's the standard​ deviation?

Math   Statistics-And-Probability   
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