Krista-Dean counted a total of 40 legs on an animal farm with only cows and ducks. It is possible that she counted ducks and cows.

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).

Select the two binomials that are factors of this trinomial x^20 - x - 20

In a the department store a $50 dresses is marked save 25% what is the discount what sale price of the dress