Please help

Problem 6: a. Find the area under the standard normal curve to the left of z = 0.5 b. Find the area under the standard normal curve to the right of z = -1.9 c. Find the area under the standard normal curve between z = 1.5 and z = 2.5 d. Find the area to the left of a = 78 under the normal curve with the mean / = 75 and the standard deviation a = 4 e. Find the area to the right of a = 74.5,under the normal curve with the mean / = 75 and the standard deviation a = 4