1. six sigma

I need help to solve a question on 6 sigma.

Ex: A magazine publishing company set a standard that subscription applications be processed within three days of receipt. If, out of a sample of 1000 applications, 50 fail to meet this requirement, at what sigma level is this process operating?

2. Originally Posted by avinash
I need help to solve a question on 6 sigma.

Ex: A magazine publishing company set a standard that subscription applications be processed within three days of receipt. If, out of a sample of 1000 applications, 50 fail to meet this requirement, at what sigma level is this process operating?
50/1000 = 0.05

So the subscription process fails to meet the three day requirement in 5%
of cases. Now we do an inverse table look up on the standard normal table to see what z score cuts of 5% of the distribution on the top end, that is we
find z0 such that:

p(z>z0)=0.05.

doing this we find that z0=1.645 which is the sigma level that the process
is operating at.

RonL