Global Warming. The following data (taken from the article

“Effects of climate change on global food production under SRES emissions and socio-economic scenarios”, published in Global Environmental Change, Vol. 14, 2004, pp. 53–67), shows the potential changes (%) in national cereal yields for a few countries with carbon dioxide effects.

Change in yield (%)

Country 2020 2080 USA 5 2.5 Canada 10 0 China 0 10 South Africa 0 −10 Australia 2.5 2.5 India −2.5 −2.5

a. Find the mean and median of the percentage of change in 2020.

b. Find the mean and median of the percentage of change in 2080.

c. If you had a list of only one country to demonstrate the percentage change in year, which would be the modal country for 2020 and 2080?

d. What might explain the difference in the modal country for 2020 and 2080?