The milling machine in the fabrication department of your company produces a very important part for the products you sell. You are given the following historical data on the machine (from a SAMPLE of n 25 weeks): Machine Number of parts Breakdowns/week Produced/week (X) (Y) average # average # of of machine breakdowns/week: produced/week: parts X bar-50 Y bar 170 standard deviation of # of machine breakdowns/week: Sx - 15 standard deviation of # of parts produced/week: Sy=40 n-25 n-25 Compute a 90% Confidence Interval for the mean number of breakdowns this machine has in a week. What are the lower and upper limits of the confidence interval?