Two candidates are running for president: John Democrat and Joe Republican. A recent survey concluded that John Democrat had a probability of 0.55 to win the election. One thousand people are interviewed at random about whom they would vote for. A random variable X is defined as the number of people who said they would vote for Joe Republican. Find the expected value of the random variable
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Step 1
We know that the probability of John Democrat winning is 0.55, so the probability of Joe Republican winning is 1 - 0.55 = 0.45. Show more…
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