1. Mathsercise-C Probability Trees Ready? Here we go!

2. Probability Trees Shay throws a dice 60 times. He scores a six, twenty times. Is the dice fair? 1 Answer Question 2 On a fair dice the probability of getting a 6 is one- sixth 1 6 x 60 = 10 So no!-the dice is not fair!

3. The probability of a green light at traffic lights is 50%. What is the probability of hitting green lights at two consecutive traffic lights? 2 Probability Trees Answer Question 3 It is better to change 50% into 0.5 0.5 x 0.5 = 0.25 “and” in probability means multiply

4. 3 Complete this probability tree for throwing a fair red dice and a fair blue dice Probability Trees Red Dice Blue Dice Six Not Six 1616 Answer Question 4 5 6 5 6 5 6 1 6 1 6

5. Look at question 3. What is the probability of not throwing a six with either a red or a blue dice? 4 Probability Trees Answer Start 5 6 5 6 25 36 x = Where do these fractions come from?