Quality control is applied to a large collection of identical items. Each item is tested and given a quality index Q which is normally distributed with mean value u = 15 and standard deviation o = 2.5. (a) For a randomly selected item the probability of having a quality index greater than 16.25 equals to normcdf(q_0). Find the value of q_0. (b) What percentage of the items would have a quality index which is less than 14? (c) Describe how 10% of the items that have the lowest Q index can be rejected