17 A bag of marbles contains: . 3 blue marbles
• 6 green marbles
. 2 white marbles
4 red marbles
• 5 yellow marbles
Lucas draws one marble from the bag 100 times, putting each marble back in the bag
before drawing another. What is a reasonable prediction for the number of times Lucas
draws a red or yellow marble?
A
9
B
35
C 45
D
18

After t seconds, a ball tossed in the air from the ground level reaches a height of h feet given by the equation h = 144t-16t^2. after how many seconds will the ball hit the ground before rebounding?

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.

Math i have no idea how to do a and b