Colding's assembly unit has decided to use a p-Chart with 2-sigma control limits to monitor the proportion of defective industrial belts produced by their production process. The production manager randomly samples 100 industrial belts at 10 successively selected time periods and counts the number of defective industrial belts in the sample. At time period 17, 150 steel bars are sampled and 20 defective steel bars are detected. Is the process still in control, or out of control?

Ascientist places 24 cells in a petri dish. she knows the cells grow at an exponential rate, doubling in number every hour. how long will it take (in hours) for there to be 1100 cells in the dish? time to 1100 cells: 5.51832530 hours how long will it take to reach 110 cells? time to 110 cells : 2.1963972 hours what is the average rate of change in the number of cells between 9 hours and 11 hours? average rate of change: cells per hour what is the instantaneous rate of change after 7 hours? instantaneous rate of change: cells per hour note: you can earn partial credit on this problem.