Question: From previous polls, it is believed that 66% of likely voters prefer the incumbent. A new poll of 500 likely voters will be conducted. In the new poll, if the proportion favoring the incumbent has not changed, what is the mean and standard deviation of the number preferring the incumbent?
A. μ = 330, σ = 10.59
B. μ = 0.66, σ = 10.59
C. μ = 330, σ = 18.17  Edit

Answer: A. μ = 330, σ = 10.59

μ= 66% of 500=330

σ=sqrt(0.66*0.34/500)=0.0211=2.11%

2.11% of 500=10.55  Edit