Only 40% of drivers properly clean their car windows after a snowstorm.

1) If you randomly observe 3 cars after a storm, what is the probability that exactly 2 have had their windows properly cleaned?

2) If you randomly observe 20 cars, what is the probability that fewer than 12 but more than 6 have had their windows properly cleaned?

3) If you randomly observe 200 cars, and let X denote the number with properly cleaned windows, what is the mean of X?

4)If you randomly observe 250 cars, what is the probability that 90 or fewer have their windows properly cleaned?