Find the expected value of the random variable

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Two candidates are running for president John Democrat and Joe Republican Recent survey concluded John had a probability of 0.52 to win 24 people interviewed at random on whom they would vote for A random  variable x is defined as the number of people who said they would vote for John Democrat Find the expected value of the random variable

Oct 21st, 2015

Thank you for the opportunity to help you with your question!

In this case, it's very simply:

0.52*24= 12.48, or simply 12. The standard deviation of such an event is sqrt(24*.52*.48) = 2.44

Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 21st, 2015

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