(a) Draw the control chart that shows the evolution of the rate U= defects/unit (in %) in one week. If the same number of units are checked every day and

the goal is 1.5%, are we achieving the expectations?

(b) Construct the Pareto Chart and sort the defects in three groups according to the frequency.

Exercise 2. The company ABC is one of the most important specialists in electronic products. In the last weeks there are several customers' complaints due to the poor quality. One of the Operations Managers starts a Quality Control to detect the possible problems. After one week, the most common defects and their frequency are in the following table: Defects 1 Too long 2 3 Wrong labelling 4 Broken 5 Wrong date 6 Wrong packaging 7 Lack of components 8 Too short Bad quality material 9 Excess of components 10 Wrong components TOTAL DEFECTS DAYS 1 3 4 5 6 7 65 12 24 55 23 28 21 14 11 20 18 10 3 3 1 2 0 4 5 0 3 0 3 0 3 0 20 16 15 18 16 18 0 8 0 3 4 5 17 11 12 17 19 24 1 0 4 0 4 2 3 69 58 55 62 5 1 7 2 4 2 50 32 57 20 4 10 59 65 6 1