1. The quality-control inspector of a production plant will reject a batch of syringes if two or more defective syringes are found in a random sample of eight syringes taken from the batch. Suppse the batch contains 2% defective syringes. Find sigma.

Question

Please show work.
Thanks

Answer 1

sigma = sqrt [np(1-p)]

http://stattrek.com/Lesson2/Binomial.aspx

Answer 2

.099