Question 1120866
Find z-values for each, where z=(x-mean)/sd
a. z<= (20-24.1)/4.3=-0.95 which has probability of 0.1711
b. z is between -0.95 and (29-24.1)/4.3 or +1.14.  Probability is 0.7018
c. Z>+1.14 with probability of 0.1271.