A random sample of 150 automobile owners in a region shows that an automobile is driven on average 24,500 kilometers per year with a standard deViation of 4200 kilometers. Assume the distribution olmeasurements to be approximately normal (a) Construct a 90% condence interval for the average number of kilometers an automobile is driven annually in the region (b) What can we asser1 with 90% condence about the possible size of our error if we estimate the average number of kilometers driven by car owners in the region to be 24,500 kilometers per year? Click here to View page 1 of the standard normal It' rihution table Click here to View p_age 2 of the standard normal it ribution table Click here to View p_age 1 of the table of critical Values of the ted ribution, Click here to View page 2 of the table of critical Values of the t-dlstnhution, (a) The condence interval is