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# Introduction to Probability

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by

## Mr Mattock

on 5 June 2018

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#### Transcript of Introduction to Probability

Introduction to Probability
Writing probabilities
Ideally as fractions

Decimals if used in the question

Words only if used in the question

Never as a ratio

Never as a mix of numbers and words.
L.O. - To understand what probability means, and how probabilities are represented.
Starter

55 >> +9 , ÷8 , x7 , -14 , ÷3 , ÷2 , square , +11 , ÷4 ………….

14 >> +16 , x2 , +3 , ÷9 , -5 , square , square , +20 , ÷4 ………….

27 >> ÷9 , square , x6 , -40 , x2 , +8 , ÷6 , +19 , ÷5 ………….

10 >> square , ÷4 , ÷5 , +3 , square , -10 , ÷6 , +4 , x2 ………….

70 >> ÷2 , +5 , ÷5 , +4 , x5 , ÷10 , square , +12 , ÷8 ………….
Starter

55 >> +9 , ÷8 , x7 , -14 , ÷3 , ÷2 , square , +11 , ÷4 …
15
.

14 >> +16 , x2 , +3 , ÷9 , -5 , square , square , +20 , ÷4 …
7
.

27 >> ÷9 , square , x6 , -40 , x2 , +8 , ÷6 , +19 , ÷5 …
5
.

10 >> square , ÷4 , ÷5 , +3 , square , -10 , ÷6 , +4 , x2 …
26
.

70 >> ÷2 , +5 , ÷5 , +4 , x5 , ÷10 , square , +12 , ÷8 …
6
.
3
5
0.6
Likely
3:5
3 out of 5
Using a scale
Using a scale
Ken
Colin
P(Ken getting
a sweet he likes)
=
3
5
P(Colin getting
a sweet he likes)
= =
1
5
5
P(Mandy getting
a sweet she likes)
= =
4
10
2
5
Mandy only likes red and green
Main Activity
Complete the RAG Sheet
Red
A
B
C
D
Amber
B
G
Y
Green
(a) (i) 3/8
(ii) 2/8 (or 1/4)
(iii) 5/8

(b) (i) 4/7
(ii) 3/7
(ii) 4/7
Bingo
Enter any of the fractions on the next screen