4.4: Expected Value of Random Variables | Exercise Solution of Probability & Statistics by Walpole

This is the start of a new chapter of the 9th edition of"Probability and Statistics for Engineers and Scientists by Walpole". In this video, I solve exercise problem 4.4 to find the expected value or average value of a random variable.
4.4 A coin is biased such that a head is three times as likely to occur as a tail. Find the expected number of tails when this coin is tossed twice.
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