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

Exhibit 8-2 A random sample of 121 automobiles traveling on an interstate showed an average speed of 65 mph. From past information, it is known that the standard deviation of the population is 22 mph. 45. Refer to Exhibit 8-2. If we are interested in determining an interval estimate for M at 96.6% confidence, the Z value to use is a. 1.96 b. 0.483 C. 2.12 d. 1.645 46. Refer to Exhibit 8-2. The standard error of the mean is a. 122.00 b. 96.60 C. 4.24 d. 2.00 47. Refer to Exhibit 8-2. If the confidence coefficient is reduced to 0.9, the standard error of the mean a. will increase b. will decrease C. remains unchanged d. becomes negative48. +Refer to Exhibit 8-2. The 96.6% confidence interval for u is a. 63.00 to 67.00 b. 60.76 to 69.24 C. 61.08 to 68.92 d. 60.00 to 80.00