The Consumer Confidence Index (CCI) attempts to measure people’s feelings about general business conditions, employment opportunities. and their own income prospects. The annual average values of the CCI for the years 1967-1996 are given in the file P2_28.XLS.

a. Fifteen percent of all years in this sample have annual CCI values that exceed what value?

b. Forty percent of all years in this sample have annual CCI values that are less than or equal to what value?

c. In which year of the given sample period were U.S. consumers most confident, as measured by the Consumer Confidence Index?

d. In which year of the given sample period were U.S. consumers least confident, as measured by the Consumer Confidence Index?