Hey, I'm new, and I need to understand how to answer this question asap.

I'm sorry if this isn't an advanced level problem (I think it's pretty advanced)

I am in a university level class called Decision Sciences << so I think it's advanced

Anyway, I would really appreatiate the help:

The quality control department of a company has decided to select a sample of 20 items from each shipment of goods it receives and inspect them for defects. It has been decided that if the sample contains no defective parts, the entire lot will be accepted.

a. what is the probability of accepting a lot that contains 10% defective items?

b. what is the probability of accepting a lot that contains 5% defective items?

c. what is the probability of rejecting a lot that contains 15% defective items?

I've tried this so many times and can't figure out how to get these answers provided by my instructer:

a. .1216

b. .3584

c. .9612

Thank you