Let X Be the Number of Tails That Come Up $E ( X ) = 2$

question 158

Multiple Choice

Let X be the number of tails that come up when a coin is tossed three times. Calculate the expected value of the given random variable X.

• A) \(E ( X ) = 2\)
• B) \(E ( X ) = 3\)
• C) \(E ( X ) = 6\)
• D) \(E ( X ) = 1.5\)
• E) \(E ( X ) = 2.25\)

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