Transcript Document

GCSE
Mathematics
Targeting Grade C
Handling Data
Unit 1 Two-Way Tables
Can you…
If not you need
TOP: Review adding and
subtracting
•Fill in a two-way table
Practice 1: Completing two-way
tables
•Answer questions from a two-way table
Practice 2: Reading information
from two-way tables
•Find probabilities from a two-way table
Practice 3: Finding probabilities
from two-way tables
Try a test
TAIL
TOP
Answers
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
1)
79
2)
6
3)
51
4)
54
5)
196
6)
125
7)
176
8)
450
9)
156
26 + 53
15 – 9
34 + 17
86 – 32
173 + 23
200 – 75
13 + 163
837 – 387
122 + 34
192 – 123
10) 69
Lesson
Are you ready for
the answers ?
Practice 1:
1)
Complete the following tables
Swimming
Boys
Gym
Total
25
45
64
100
Students are asked
if they prefer to go
swimming or to the
gym.
Girls
Total
2) Some people are asked about their favourite outdoor sport.
Under 15’s
15 – 30
Over 30
Total
Lesson
Hiking
42
30
Canoeing Climbing Total
150
30
47
100
15
75
300
Practice 2:
Copy and complete the following two-way table about
ways of eating potato and then answer the questions.
New
Chips
Boys
Girls
25
Teachers
12
Total
1)
2)
3)
4)
Mash
Total
34
100
22
50
37
104
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?
Lesson
250
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
100
Teachers
12
16
22
50
Total
52
104
94
250
1)
What is the probability the person picked is a boy?
2)
What is the probability the person liked mash?
3)
What is the probability the person was a teacher who preferred new
potatoes?
4)
What is the probability that, out of the girls, the person liked chips?
5)
Out of the people who liked chips, what is the probability the person was a
boy?
Lesson
TAIL
For the following table, copy and complete it, then answer the questions
about types of coffee bought.
Coffee is sold in
100g
200g
300g
Total
three types and in
three weights.
Ground
50
120
Powder
80
35
Granules
40
45
Total
135
26
135
400
a)
How many people bought 100g of powdered coffee?
b)
How many people bought ground coffee?
c)
Out of the packets weighing 200g, what is the probability the packet
bought contained granules?
Are you ready for
the answers ?
Next
Answers
100g
200g
300g
Total
Ground
15
50
55
120
Powder
80
35
26
141
Granules
40
45
54
Total
135
130
(a) 80
(b) 120
(c) 45/130
Lesson
135
139
400