Barack Obama
Bill Clinton,the Former President of the United States,believes $\hat { p }$

Barack Obama
Bill Clinton,the former President of the United States,believes that the proportion of voters who will vote for Barack Obama in the year 2012 presidential elections is 0.65.A sample of 500 voters is selected at random.
-{Barack Obama Narrative} Find the expected value and the standard deviation of the sample proportion $\hat { p }$ .