Handling Data Two-Way Tables

Can you… If not you need Fill in a two-way table Answer questions from a two-way table Find probabilities from a two-way table Try a test TOP: Review adding and subtracting Practice 1: Completing two-way tables Practice 2: Reading information from two-way tables Practice 3: Finding probabilities from two-way tables TAIL If not you need

TOP 26 + 53 15 – 9 34 + 17 86 – 32 173 + 23 200 – 75 13 + 163 837 – 387 122 + 34 192 – 123 Answers 79 6 51 54 196 125 176 450 156 69 Are you ready for the answers ? Lesson

Hiking Canoeing Climbing Total Under 15’s 42 150 15 – 30 30 47 100 Practice 1: Complete the following tables 1) Students are asked if they prefer to go swimming or to the gym. 2) Some people are asked about their favorite outdoor sport. Swimming Gym Total Boys 25 45 Girls 64 100 20 55 39 16 36 Hiking Canoeing Climbing Total Under 15’s 42 150 15 – 30 30 47 100 Over 30 15 75 300 40 68 23 5 50 95 130 Lesson

New Chips Mash Total Boys 34 100 Girls 25 37 Teachers 12 22 50 104 250 Practice 2: Copy and complete the following two-way table about ways of eating potato and then answer the questions. How many boys liked mash? How many teachers preferred new potatoes? How many girls were asked? Out of the people who liked chips, how many were boys? New Chips Mash Total Boys 34 100 Girls 25 37 Teachers 12 22 50 104 250 15 51 38 100 16 52 94 34 12 100 51 Lesson

Practice 3: For the following two-way table answer the questions on probability. A person is picked at random from the sample. New Chips Mash Total Boys 15 51 34 100 Girls 25 37 38 Teachers 12 16 22 50 52 104 94 250 What is the probability the person picked is a boy? What is the probability the person liked mash? What is the probability the person was a teacher who preferred new potatoes? What is the probability that, out of the girls, the person liked chips? Out of the people who liked chips, what is the probability the person was a boy? Desired outcomes 100 All possible outcomes 250 94 250 52 250 37 100 51 Lesson 104

TAIL For the following table, copy and complete it, then answer the questions about types of coffee bought. Coffee is sold in three types and in three weights. How many people bought 100g of powdered coffee? How many people bought ground coffee? Out of the packets weighing 200g, what is the probability the packet bought contained granules?   100g 200g 300g Total Ground 50 120 Powder 80 35 26 Granules 40 45 135 400   100g 200g 300g Total Ground  15 50 55  120 Powder 80 35 26 141  Granules 40 45 54  139 135 130  400 (a) 80 (b) 120 (c) 45/130 Are you ready for the answers ? Next