Four buses carrying 156156 high school students arrive to Montreal. The buses carry, respectively, 3434, 4141, 3232, and 4949 students. One of the studetns is randomly selected. Let XX denote the number of students that were on the bus carrying this randomly selected student. One of the 44 bus drivers is also randomly selected. Let YY denote the number of students on his bus. Compute the expectations of XX and Y

Ahigh-altitude spherical weather balloon expands as it rises, due to the drop in atmospheric pressure. suppose that the radius r increases at the rate of 0.02 inches per second, and that r = 36 inches at time t = 0. determine the equation that models the volume v of the balloon at time t, and find the volume when t = 360 seconds. v(t) = 4π(0.02t)2; 651.44 in3 v(t) = 4π(36 + 0.02t)2; 1,694,397.14 in3 v(t) = four pi times the product of zero point zero two and t to the third power divided by three.; 4,690.37 in3 v(t) = four pi times the quantity of thirty six plus zero point zero two t to the third power divided by three.; 337,706.83 in3