An unequal probability sample of size 3 is selected from a population of size 10 with replacement. The y-values of the selected units are listed along with their draw-by-draw selection probabilities: y1 = 3, p1 = 0.06; y2 = 10, p2 = 0.20; y3 = 7, p3 = 0.10. (a) Estimate the population total using the Hansen-Hurwitz estimator. (b) Estimate the variance of the estimator.