Please refer to the attached image for the list of questions I need help answering.

Exhibit 8-1 In order to estimate the average time spent on the computer terminals per student at a local university, data were collected for a sample of 81 business students over a one-week period. Assume the population standard deviation is 1.8 hours. 42. Refer to Exhibit 8-1. The standard error of the mean is a. 7.50 b. 0.39 C. 2.00 d. 0.20 43. + Refer to Exhibit 8-1. With a 0.95 probability, the margin of error is approximately a. 0.39 b. 1.96 C. 0.20 d. 1.64 44. Refer to Exhibit 8-1. If the sample mean is 9 hours, then the 95% confidence interval is a. 7.04 to 110.96 hours b. 7.36 to 10.64 hours C. 7.80 to 10.20 hours d. 8.61 to 9.39 hours