Home » Certification Exams Questions » A process produces rubber tires on a continuous basis. Past process performance indicates 2% chance of the bottles having one or more flaws. If we draw a sample of 20 units from the lot, what is the probability we will have 0 defectives?

A process produces rubber tires on a continuous basis. Past process performance indicates 2% chance of the bottles having one or more flaws. If we draw a sample of 20 units from the lot, what is the probability we will have 0 defectives?

OPTIONS

0.66
0.62
0.6
0.5

ANSWER

0.66

EXPLANATION

Applying standard binomial formula with p = 0.02 and x = 0.

«For a capability study conducted on normal data, the reported set of values are Cpk = 1.2 and Ppk = 1.4. What could be the Black Belt’s inference?

For a conservatively large sample size and p >0.5, the Binomial Distribution approximates»