Suppose that a class contains 10 boys and 15 girls, and suppose that eight students are to be selected at random from the class without replacement. let x denote the number of boys that are selected, and let y denote the number of girls that are selected. find e(x − y ).

20 sharpened pencils are placed in a box containing an unknown number of unsharpened pencils suppose 15 pencils are removed at random and five of the remove pencils are sharpened based on this is it reasonable to assume that the number of unsharpened pencil is 40 explain your reasoning