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

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) $E ( X ) = 2.25$