Can get the results for this question using Excel, if so what is the process?

When a particular machine is functioning properly, 80% of the items produced are non-defective.

1.If seven items are examined, what is the probability that three are defective?

2.If seven items are examined, what is the probability at least three are non-defective?

3.If seven items are examined, what is the probability that at most, one is defective?

4.What is the expected number of defective items if ten items are examined?