Abox holds 18 chocolates and has a gross mass of 310 g. each chocolate weighs the same. when 8 chocolates have been eaten, the box and the remaining chocolates together have a mass of 210 g. what is the mass of each chocolate?

The discrete random variables x and y take integer values with joint probability distribution given by f (x,y) = a(y−x+1) 0 ≤ x ≤ y ≤ 2 or =0 otherwise, where a is a constant. 1 tabulate the distribution and show that a = 0.1.2 find the marginal distributions of x and y. 3 calculate cov(x,y).4 state, giving a reason, whether x and y are independent. 5 calculate e(y|x = 1).