STATISTICS 99
The incomplete pictograph shows the number of pupils in a standard Scians and their
favourite subject. There is a total of 20 pupils in the class
Subjects
Number of pups
Maths
English
Science
b.
不不
i i
Art
The number of pupils who selected English as their favourite represents
of the total pupils. How many pupils does represent?​

Four airplanes carrying a total of 400 passengersarrive at the detroit airport. the airplanes carry, respectively,50, 80, 110, and 160 passengers. a) one of the 400 passengers is selected uniformly at random. let x denote the number of passengers that were on theairplane carrying the randomly selected passenger. find var(x)for x as given in the problemb) one of the 4 airplane drivers is also selected uniformly atrandom. let y denote the number of passengers on the chosen driver’s airplane. find var(y) for y as given in the problem

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.

Do some research and find a city that has experienced population growth. determine its population on january 1st of a certain year. write an exponential function to represent the city’s population, y, based on the number of years that pass, x after a period of exponential growth. describe the variables and numbers that you used in your equation.