1) All values above the mean have a positive z-score
2) (87-82) / 5 = +1.00
3) x = (-0.8)(2.5) + 67.5 =
65.5 inches
Use NORMALCDF for #4 and #5
4) Lower = -1.24 Upper = 0.98 Area under the curve = 0.729
5) Lower = -0.73 Upper = 1E99 (infinity) Area under the curve = 0.767
