"49. TheWorld Population DataSheet (source: Population Reference Bureau, prb.org) providescomprehensive data on world population trends. The table below shows birthrates for fiveselected countries, alongwith each country's GNI (Gross National Income) per capita.

Country Annual Birth rate per 1,000 population GNI per capita

Egypt 25 5,680

Australia 14 38,510

Brazil 15 10,160

US 13 45,640

Germany 8 36,850"

Compute and interpret the covariance.

69.The WallStreet Journal reportedthat the Chinesegovernment is planningto adopt morestringent automobile fuel efficiency standards to keep oil con-Sumption in check (source:WSJ.com). The standards vary depending onthe type ofvehicle. An SUVis required toget 17 mpg(miles per gallon).Medium weight passengercars are requiredto get 25mpg, and lighterpassenger cars arerequired to get33 mpg. IfFord Motors-China lastyear sold 138,000SUVs, 291,000 mediumweight passenger cars,and 482,000 lightpassenger cars inChina, and allmet precisely thefuel efficiency standardsdescribed.

what wasthe average mileagefor the totalfleet of vehicles sold by the company?"