:7. Solution. The area under the normal curve between 0 and
1.65 is one half of 90%, or 45%. The area under the normal curve
between 0 and 0.5 is one half of 38%, or 19%. So the area under
the normal curve between 0.5 and 1.65 is 45 - 19 = 26%. The
closest of the choices is 25%.