What is the expected number of tails?

Question

An unfair coin with Pr(H)=1/3  is flipped 87 times.  What is the expected number of Tails?

Answer 1

Since the probability of heads is 1/3, the probability of getting tails is 2/3.

So we expect 2/3 of our tosses to be tails, thus the expected value is (2/3)(87)=58.