A process consists of three sequential steps with the follow

A process consists of three sequential steps with the following yields: Y1 = 97.8, Y2 = 98.4, Y3 = 99.4. Calculate the rolled throughput yield (RTY) using Method 2. Using the Six Sigma conversion table, what is the estimated sigma level?

Solution

RTY = yield 1 * yield2 * ytield 3

RTY = 0.978*0.984*0.994 = 0.9566

estimated sigma level +/- 2.512