What is the Ppk of a process with a spread of 24 units, an average of 68, an upper limit of 82 and a lower limit of 54?

6 thoughts on “What is the Ppk of a process with a spread of 24 units, an average of 68, an upper limit of 82 and a lower limit of 54?”

1. (82-68)/3*sigma = 14/(3*4)= 14/12 = 1.17
   All answers given are wrong

   Reply

2. Can someone explain it again. what is spread and what is long term sigma. and how we obtain the answer 4?

   2

   Reply

3. 14 (Min LSL/USL) / 3,5 (Sigma) = 4 (C)

   1

   Reply

4. 3 times sigma is actually half the spread. In this case, is 24.

   Reply

   1. I meant 12.

      1

      Reply

5. how , can you help please

   1

   Reply

6. could you please send me the formula you used to come to answer “c”. Both average minus LSL and USL minus average are 14. this would mean 3 times sigma is 3.5. How to come from “spread” of 24 units, to a sigma Long Term of 3.5. I don’t get that.

   thanks

   4

   Reply