Find the Mean of the Binomial Random Variable

Multiple Choice

Find the mean of the binomial random variable. Round to two decimal places when necessary.
-In a certain town, 90 percent of voters are in favor of a given ballot measure and 10 percent are opposed. For groups of 180 voters, find the mean for the random variable X, the number who Oppose the measure.

A) 10
B) 90
C) 18
D) 162