4. (20 points) According to a poll, 42% of American voters have confidence in the effectiveness of the new COVID vaccine. Suppose that you interview 21 Americans voters at random. Answer the following questions, to get the probabilities, you should use R and Show your code and output. a. What is the probability that 6 or fewer voters have confidence in the vaccine? Q10 What is the probability that 8 or more voters have confidence in the vaccine? What is the probability that 9 voters have confidence in the vaccine? Q12 What is the expected number of voters have confidence in the vaccine? P-PP