60% of students are \"young\" [less than 50 years) and the rest are \"old\". 35% of the young and 85% of the old use eyeglasses. From the population we take a random sample of 100 persons With replacement. The random variable X!- is 1 if the ith person in the sample is old, otherwise 0. The random variable Y;- is 1 if the 75th person uses eyeglasses, otherwise 0. Furthermore X is the number of old people in the sample and Y is the number of people using eyeglasses in the sample. a.) Calculate lE(X1) and IE(X). b.) Calculate EGG) and E(Y). c.) Calculate Cov(X1,Y1). (1.) Calculate Cov(X1, Y2). e.) Calculate Cov(X,Y)