q20 Suppose the chance that you win on a random scratch-off lottery ticket is .10.

Choose 10 scratch-off lottery tickets at random. What is the chance that at most 9 of them are winners

.90^10

1-.90^10

.10^10 (to the 10th power)

1-.10^10

q21 Suppose 63% of the U.S. population are annoyed by other people's cell phone conversations. Of those who are annoyed, 20% have cell phones. Of those not annoyed, 32% own cell phones.Suppose someone has a cell phone. Are they more likely to be annoyed or not annoyed?

Not annoyed

Equally likely to be annoyed or not annoyed

Annoyed

Not enough information to tell