Aakanksha R.

asked • 01/06/20

A bag contains four fair coins and one biased coin that comes up heads with probability 3/4. Assume that you randomly select a coin from the bag and toss it.


(a) Draw a tree diagram representing the situation.

(b) What is the probability that the coin comes up heads? (c) If the coin comes up heads, what is the probability that it is fair?

Assume instead that you randomly select four coins from the bag and toss them.

(d) What is the probability that the biased coin is among those selected?

(e) What is the expected number of heads for the four coins?


I'm confused what to do in part d and e? Please help


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