bernardhenderso4689 bernardhenderso4689 Today at 5:47 AM Mathematics Answered (a) Show that a 2×4−MA is equivalent to a weighted 5−MA with weights 1/8,1/4,1/4,1/4,1/8. [9 marks] (b) Show that the variance of an I(1) series is not constant over time. [9 marks ]