1.Betty plans to have two children but doesn't know if they will be boy-boy, girl-girl, or boy-girl. What is the probability that she will have two girls?

2.The length of an instant message conversation is normally distributed with a mean of 5 minutes and a standard deviation of .7 minutes. What is the probability that a conversation lasts longer than 6 minutes?

3. Pam is looking for a new car. She has test-driven two cars but can only purchase one. The probability that she will purchase car A is 0.46, and the probability that she will purchase car B is 0.34. What is the probability that she will not purchase either car A or car B?

4. Sam claims that his cat can do single-digit multiplication. He shows the cat 10 cards with simple multiplication problems that are either correct or incorrect. The cat correctly identifies the correctness of the card 7 times out of 10. If the cat were simply guessing, how many would the cat be expected to get correct?