7. Determine the sample size for surveying customers at a store in a mall if there are 330 customers out of 8,250 customers at all the corporation's stores. Assume the confidence level is 95 percent and the accepted margin of error is 0.05.

8.Determine the sample size of the previous exercise assuming that the sample of customers will be taken from one of the departments of the store where there are a total of 150 customers.