A manufacturer of disk drives for notebook com- wants an MTBF of at least 50,000 hours. Recent test 10 units were one failure at 10,000 hours, another results for 25,000 hours, and two more at 45,000 hours. The remaining at were still running at 60,000 hours. Determine the following: units a) Percent of failures b) Number of failures per unit-hour c) MTBF at this point in the testing

You are a manager at asda. you have been given the demand data for the past 10 weeks for swim rings for children. you decide to run multiple types of forecasting methods on the data to see which gives you the best forecast. if you were to use exponential smoothing with alpha =.8, what would be your forecast for week 22? (the forecast for week 21 was 1277.) week demand 12 1317 13 1307 14 1261 15 1258 16 1267 17 1256 18 1268 19 1277 20 1277 21 1297