Given a normal distribution with u = 40 and o = 9, find (a) the normal curve area to the right of x 20; (b) the normal curve area to

the left of x = 30; (c) the normal curve area between x= 48 and x = 55; (d) the value of x that has 65% of the normal curve area to the left; and (e) the two values of x that contain the middle 70% of the normal curve area.