1. Of the adults in Jefferson County, 10% have had CPR training. For a randomly selected group of adults from this county, how large would the group have to be in order for the probability that at least one group member has had CPR training to be at least 0.90?
2. Over the years, a realtor estimates that 50% of those who contact her about a listing end up allowing her to provide a guided tour of the property, 20% of those who take a guided tour follow up with a request for more information about the property, and 2% of those who make the follow-up informational request actually end up making an offer on the property. The realtor has just taken a young couple on a guided tour of one of her listed properties. Based on the probability estimates provided above, what is the probability that the young couple will actually make an offer on the property?