Starter

1. 7A will win sports day 7A will win sports day 0 ½ 1 5 minutes to get your things together and try this exercise Starter Place the following events on the probability scale

2. I am looking for students who can use the correct notation for probability Chapter 28: Chance Cannot occur at the same time Write the title and date (2) Calculating Probability Today we will learn how to calculate the probability of an exclusive event

3. How do we calculate probabilities? What is the probability of choosing the following colors? Red Blue Green 3/10 0.3 5/10 1/2 0.5 2/10 1/5 0.2

4. How do we calculate probabilities? Probability of an event = number of successful outcomes total number of outcomes So from my packet of what is the probability the next one is orange, green, purple, white and yellow? We need some information: 3 oranges 3 green 4 whites 1 yellow 5 purple 3/16 3/16 1/16 1/4 5/16

5. 3/20 In my ‘bag of sweets for good children’ I have 20 sweets; 3 of them are my favorite éclairs. • what is the probability that the first good child picks an éclair? • what is the probability that the first good child does not pick an éclair? • The probability of choosing a diamond card from a standard pack of cards is 0.25 what is the probability of choosing any other suit? • The probability I loose a thumb wrestling match is 0.85, what is the probability I win? 17/20 0.75 0.15

6. Bonus Question - Easy • The letters of the word HIPPOPOTAMUS are placed in a tub and a letter is taken at random. What is the probability of taking out: • H • M • O • P 1/12 1/12 1/6 1/4

7. 6 X 3/5 2/5 5/5 1 Bonus Question - Hard A bag contains 6 red balls and some white balls. When a white ball is taken from the bag at random, the probability that it is red is 3/5, how many white balls are in the bag? 4 10

8. Now its Your Turn: Page 352 from the E1 books Exercise E, F and G