Letxandybe i. i.d. n(0,1), and letsbe a random sign (1 or−1, withequal probabilities) independent of (x,) determine whether or not (x, y,x+y) is multivariate normal.(b) determine whether or not (x, y,sx+sy) is multivariate normal.(c) determine whether or not (sx, sy) is multivariate normal.

If the regular price was $115, how much did jeanine pay for the hiking boots? jeanine bought a new pair of hiking boots on sale for 25% off the regular price. enter the correct answer. ooo done clestall the following formula describes this scenario: đoo s = r. 0.25 r = regular price s = sale price