Life expectancy is the average number of years to be lived by a group of people born in the same year if mortality at each age remains constant in the future. From the World FactBook, published by the Central Intelligence Agency (CIA), we obtained the life expectancy for people in various countries. Those data are presented on the WeissStats site.

a. Identify the population and variable under consideration.

b. Use the technology of your choice to obtain and interpret a frequency histogram, a relative-frequency histogram, or a percent histogram of the data.

c. Use the technology of your choice to obtain a dotplot of the data.

d. Use the technology of your choice to obtain a stem-and-leaf diagram of the data.

e. Identify the modality and symmetry (or nonsymmetry) of the distribution.

f. If the distribution is unimodal and nonsymmetric, state whether it is right skewed or left skewed.