Question 2 - Mean and Variance of Binary Variables Imagine that you want to know a little more about the nationality of the students in your ctass. You observe a binary variable equal to 1 if the student has Canadian nationality and 0 otherwise. To answer this question, you can use the following notation: Hg is the number of students with Canadian nationality. NA is the number of students without Canadian nationality and N is the total number of students in the class (N; + NA=N). a} Using the population mean formula. show that when you compute the average of the binary variable described above, you will get the proportion (NdN) of students who are Canadian citizens (in the classroom}. {0.3 points) b} Using the population variance formula. show that the variance of the binary variable described above is equal to (NC at Mama. (0.? points}