math quiz!

[quarrel]

Twenty points per question, five questions. Partial credit is possible. No time limit.

1. 90% of riders involved in motorcycle crashes have not taken a motorcycle safety training course. How much does taking a motorcycle training course lower your chance of being involved in a crash?

2. You're playing a fantasy RPG and have a choice between two swords. Sword A deals 10 damage and can be swung every 2 seconds. Sword B deals 14 damage but takes 3 seconds to swing. Which is better?

3. It's 78 degrees in Beaverton. Ninety miles away, in Salmon Falls, it's 72 degrees. Oakmont lies directly at the midpoint on a line between those two cities. What is the temperature there?

4. Suppose that last year there were 600 fatalities from car-related accidents. Also suppose that only 50% of all car occupants wore seat belts. How many fatalities will there be next year from car-related accidents if a mandatory seat belt law is passed?

5. The weather report says there's a 40% chance of rain tomorrow at noon, 45% at 3:00 pm and 50% at 6:00 pm. What is the chance that it rains tomorrow?