Find the expected value of the random variable

User Generated

furyof05

Mathematics

Description

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

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Explanation & Answer

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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

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