7. A study was performed on the sustainability behaviors of CPA corporations based on the responses of all the senior managers. Corporate sustainability refers to business practices designed around social and environmental considerations. The level of support senior managers have for corporate sustainability was measured quantitatively on a scale ranging from 0 to 160 points. The study provided the following information on the distribution of levels of support for sustainability: =73, =22 and median = 65.

a. Consider a random sample of 25 senior managers. What is the probability that the average levels of support for sustainability in the sample is greater than 80?

b. If a random sample of 45 senior managers. What is the probability that the average levels of support for sustainability in the sample is greater than 80?

c. If a random sample of 45 senior managers. What is the probability that the average levels of support for sustainability in the sample is between 65 and 70?

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