Refer to the Business and Society (March 2011) study on the sustainability behaviors of CPA corporations, Exercise 2.23. Recall that the level of support for corporate sustainability (measured on a quantitative scale ranging from 0 to 160 points) was obtained for each of 992 senior managers at CPA firms. The accompanying Minitab printout gives the mean and standard deviation for the level of support variable. It can be shown that level of support is approximately normally distributed.

a. Find the probability that the level of support for corporate sustainability of a randomly selected senior manager is less than 40 points. .151

b. Find the probability that the level of support for corporate sustainability of a randomly selected senior manager is between 40 and 120 points. .823

c. Find the probability that the level of support for corporate sustainability of a randomly selected senior manager is greater than 120 points. .026

d. One-fourth of the 992 senior managers indicated a level of support for corporate sustainability below what value? 49.63