According to a Pew Research Center poll, 22% of adult Americans have contributed to an online fundraising project. A random sample of 100 adults is selected.
Let the random variable X be the number of adult Americans who have contributed to an online fundraising project.
(a) Find the probability of getting exactly 12 adults who have contributed to an online fundraising project. Give your calculator input and round to three significant figures.
(b) Find the probability of getting at most 30 adults who have contributed to an online fundraising project. Give your calculator input and round to three significant figures.