P2. A complex electronic device is made of 10 parts. Over a year, the parts break down independently, with a probability of 0.01.

(a) What is the probability of observing at least two breakdowns over a given

year?

(b) What is the probability of observing three or four breakdowns over a given

year?

(c) On average, how many breakdowns should be expected over a given year?

(d) Calculate the standard deviation of the number of breakdowns over a given

year.