Probability03

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Probability03

  1. 1. February 25, 2009 Zhu Shijiei 1261 Pascal 1653
  2. 2. February 25, 2009 Find a pattern, add two more rows to the triangle ... 1 1 1 1 1 1 1 2 1 1 2 1 1 3 3 1 1 3 3 1 1 4 6 4 1 1 4 6 4 1
  3. 3. February 25, 2009 Pascal's Triangle How many different patterns can you find in the triangle?
  4. 4. February 25, 2009 Suppose that, when you go to school from home, you like to take as great a variety of routes as possible, and that you are equally likely to take any possible route. You will walk only east or south. (a) How many ways can you go to the post office? (b) How many ways can you go to school? (c) What is the probability that you will walk past the post office on your way to school?
  5. 5. February 25, 2009 There are 3 ways to get to the post office. For each of those 3 ways, there are 4 ways to get to school - so altogether, there are 12 ways to get from home to school past the post office.
  6. 6. February 25, 2009 How many ways can the word RIVER be found in the array of letters shown to the right if you start from the top R and move diagonally down to the bottom R?
  7. 7. February 25, 2009 HOMEWORK A water main broke in our neighborhood today. My kids want to get to the park to play as quickly as they can so we only walk South or East. How many different quot;shortest pathsquot; are there from our house to the park walking on the sidewalks along the streets?
  8. 8. February 25, 2009 HOMEWORK How many ways can the word quot;MATHEMATICSquot; appear in the following array if you must spell the word in proper order?
  9. 9. February 25, 2009 HOMEWORK The diagram below shows a game of chance where a ball is dropped as indicated, and eventually comes to rest in one of the four locations labelled A, B, C, or D. The ball is equally likely to go left or right each time it strikes a triangle. We want to determine the theoretical probability of a ball landing in any one of these four locations. To do this, we need to know the total number of paths the ball can take, and also the number of paths to each location.
  10. 10. February 25, 2009 As your birthday approaches you are looking for ways to make money so you can buy a used car. Currently, you earn $10 a week for doing chores around the house. Your parents realize that you are trying to save up, and offer you the following deal. You can either be paid the $10, or you can pull two bills from a brown paper bag. In the bag there are two $1 bills, two $5 bills, and a $10 bill. For example, you might pull out a $1 bill followed by a $5 bill, and earn only $6. Or you might pull out the $10 bill followed by a $5 bill and earn $15. If you were given this option every week, what would be better for you to do in the long run? Is pulling two bills from the paper bag a great way to make money? Be sure to give a complete explanation of how you found your answer.
  11. 11. February 25, 2009 HOMEWORK What is the probability of spinning each of the following using the spinner shown? The colours on the spinner are red, yellow, and blue. 1. P(red) 2. P(yellow) 3. P(green) 4. P(red, yellow or blue) 5. P(not red)
  12. 12. February 25, 2009 HOMEWORK Design an experiment using coins to simulate a 10 question true/false test. What is the experimental probability of scoring at least 70% on the test if you guess each answer?
  13. 13. February 25, 2009 HOMEWORK Design an experiment to determine the probability of passing a six-question multiple choice test if you guess all the answers. Each question has four answers, and one answer is correct in each case. How many simulations would seem reasonable? What is the experimental probability of getting at least 50% on the test?

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