Requiring photo identification has been a controversial practice in recent elections. According to a Gallup poll, 80% of all Americans favor requiring all voters to provide photo identification at their voting place in order to vote. A random sample of 30 Americans is selected.

a. What is the probability that more than 25 favor requiring photo identification?

b. What is the probability that at least 25 favor requiring photo identification?

c. What are the mean value and standard deviation of the number who favor the requirement?