Use the standard normal table in Appendix A to find the area
a. Above (that is, to the right of) a point that’s 2.0 standard deviations below the mean.
b. In an interval starting 1.57 standard deviations to the right of the mean and ending 2.36 standard deviations to the right of the mean.
c. In an interval starting 2.0 standard deviations to the left of the mean and ending .5 standard deviations to the left of the mean.