Fifty percent of Americans believed the country was in a recession, even though technically had not shown two straight quarters of negative growth (Business Week, July 30, 2001). For a sample of 20 Americans, make the following calculations.
a. Determine the probability that exactly 12 people believed the country was in a recession.
b. Determine the probability that no more than five people believed the country was in a recession.
c. How many people would you expect to say the country was in a recession.
d. Determine the variance and standard deviation of the number of people who believed the country was in a recession