Prob.Distribution: quality-control testing of balloons

[Kiran]

A manufacturer of balloons finds out that 3.0% of its balloons fail quality-control testing.
a) what is the probability that one of the first five balloons tested will be defective?
b) what is the expected waiting time for a defective balloon?

 

[stapel]

What are your thoughts? What have you tried? How far have you gotten? Where are you stuck?

Please be complete. Thank you!

Eliz.