According to statista.com, 22% of adult internet users in the United States use Twitter. Suppose we randomly and independently selected 50 adult internet users in the U.S. Use your calculator to find the following probabilities. Write the calculator function and the values you entered.

b) What is the probability that at least 20 of them use Twitter?

c) What is the probability that between 5 and 15, inclusive, adult internet users use Twitter?