L1 Probability StartersLinks
Probability Starter 1 Probability Starter 1 Solns
Probability Starter 2 Probability Starter 2 Solns
Probability Starter 3 Probability Starter 3 Solns
Probability Starter 4 Probability Starter 4 Solns
Probability Starter 5 Probability Starter 5 Solns
Probability Starter 6 Probability Starter 6 Solns
Probability Starter 7 Probability Starter 7 Solns
Probability Starter 8 Probability Starter 8 solns
Probability Starter 9 Probability Starter 9 solns
Probability Starter 10 Probability Starter 10 solns
A
BC
1st slide
1)
2)
5)
3)
4)
Find the probability of being a Boy
Boys Girls Totals
Cat 12 8 20
Dog 16 14 30
28 22 50
Favourite pets
Find the probability of a Dog being favourite pet
Find the probability that a Boy has a Cat as favourite pet
Find the probability of being a girl, given that a dog is a favourite pet
Find the probability of being a Boy and having a Cat as favourite pet
Probability Starter 1
Probability Starter 1 Solns
1)
2)
5)
3)
4)
Find the probability of being a Boy
Boys Girls Totals
Cat 12 8 20
Dog 16 14 30
28 22 50
Favourite pets
Find the probability of a Dog being favourite pet
Find the probability that a Boy has a Cat as favourite pet
Find the probability of being a girl, given that a dog is a favourite pet
Find the probability of being a Boy and having a Cat as favourite pet
1st slide
Probability Starter 2
1)
2)
5)
3)
4)
Find the probability getting ‘A’ on both spins
A simple lottery wheels is spun twice
Find the probability spinning a ‘B’ or a ‘C’
Find the probability of the two spins being in alphabetical order
Find the probability of spelling CAB in 3 spins
Find the probability of spinning a pair the same
AB
C
1st slide
Probability Starter 2 Solns
1)
2)
5)
3)
4)
Find the probability getting ‘A’ on both spins
A simple lottery wheels is spun twice
Find the probability spinning a ‘B’ or a ‘C’
Find the probability of the two spins being in alphabetical order
Find the probability of spelling CAB in 3 spins
Find the probability of spinning a pair the same
AB
C
1st slide
Probability Starter 3
1)
2)
5)
3)
4)
Find the probability getting a ‘star’ card first
A shop runs a promotion with one of 5 cards given with each purchase (there are a very large number of cards)
Find the probability of getting a yellow card first
If you select a blue card, what's the chance it is a moon?
Find the probability of getting a blue card first, then a red card
Find the probability of getting two stars in a row
1st slide
Probability Starter 3 Solns
1)
2)
5)
3)
4)
Find the probability getting a ‘star’ card first
A shop runs a promotion with one of 5 cards given with each purchase (there are a very large number of cards)
Find the probability of getting a yellow card first
If you select a blue card, what's the chance it is a moon?
Find the probability of getting a blue card first, then a red card
Find the probability of getting two stars in a row
1st slide
Probability Starter 4
1)
2)
5)
3)
4)
Find the probability getting a red card first
Two cards are selected at random
from this hand
Find the probability of getting an Ace or Queen first
If you select a Queen first, what's the chance of getting a Queen 2nd
Find the probability of getting a 4 first, then a 6 next
Find the probability of getting two Queens
1st slide
Probability Starter 4 Solns
1)
2)
5)
3)
4)
Find the probability getting a red card first
Two cards are selected at random
from this hand
Find the probability of getting an Ace or Queen first
If you select a Queen first, what's the chance of getting a Queen 2nd
Find the probability of getting a 4 first, then a 6 next
Find the probability of getting two Queens
1st slide
Probability Starter 5
1)
2)
5)
3)
4)
Find the probability of Bill getting a 4 OR 5
Bill rolls a dice
Find the probability of Bill getting a 5 and Ted getting a 1
Find the probability of Bill & Ted getting the same result
Find the probability of Ted rolling a score greater than Bills roll
Ted rolls a dice
Find the probability of Ted rolling twice Bills roll
1st slide
Probability Starter 5 Solns
1)
2)
5)
3)
4)
Find the probability of Bill getting a 4 OR 5
Bill rolls a dice
Find the probability of Bill getting a 5 and Ted getting a 1
Find the probability of Bill & Ted getting the same result
Find the probability of Ted rolling a score greater than Bills roll
Ted rolls a dice
Find the probability of Ted rolling twice Bills roll
1st slide
Probability Starter 6
1)
2)
5)
3)
4)
Copy & complete the probability tree
Find the probability of MTB crash and being late
Find the probability of being late
Find the probability of being late IF there was no crash
Given that I crash my MTB find the probability of being on time
MTB crash
Nocrash
Late
On time
Late
On time
0.15
0.8
0.05
1st slide
Probability Starter 6 Solns
1)
2)
5)
3)
4)
Copy & complete the probability tree
Find the probability of MTB crash and being late
Find the probability of being late
Find the probability of being late IF there was no crash
Given that I crash my MTB find the probability of being on time
MTB crash
Nocrash
Late
On time
Late
On time
0.15
0.8
0.05
0.95
0.2
0.85
1st slide
Probability Starter 7
1)
2)
5)
3)
4)
Find the probability of the first spin being a 4
Find the probability of the two spins being the same number
Find the probability of the two spins adding to 8
Find the probability the first spin being greater than the 2nd
2
54
3A numbered lottery spinner is spun twice
Find the probability of the two spins adding to 7
1st slide
Probability Starter 7 Solns
1)
2)
5)
3)
4)
Find the probability of the first spin being a 4
Find the probability of the two spins adding to 8
Find the probability the first spin being greater than the 2nd
2
54
3A numbered lottery spinner is spun twice
Find the probability of the two spins adding to 7
Find the probability of the two spins being the same number
1st slide
Probability Starter 8
1)
2)
5)
3)
4)
Copy & complete the probability tree
Find the probability of doing no study & passing the test
Find the probability of passing the test
35% of people who study & pass the test get ‘merit’ What is the chance of this happening?
What is the chance of passing and not getting a ‘merit’ given that a student did study for the test.
Study
Nostudy
Passed
No Pass
Passed
No Pass
0.7
0.8
70% of students study for a test. 80% of those who did study passed the test, but only 45% of those who no study passed the test
1st slide
Probability Starter 8 solns
1)
2)
5)
3)
4)
Copy & complete the probability tree
Find the probability of doing no study & passing the test
Find the probability of passing the test
35% of people who study & pass the test get ‘merit’ What is the chance of this happening?
What is the chance of passing and not getting a ‘merit’ given that a student did study for the test.
Study
Nostudy
Passed
No Pass
Passed
No Pass
0.7
0.8
0.45
70% of students study for a test. 80% of those who did study passed the test, but only 45% of those who no study passed the test
0.55
0.2
0.3
1st slide
Probability Starter 9
1)
2)
5)
3)
4)
Copy & complete the probability tree
Find the probability of a duck being shot at & living
Find the probability of a duck living
70% of ducks who die when shot at are found by the hunter. What is the chance of this happening?
If a duck was shot at, what is the chance of a duck not being found by the hunter?
Shot at
Not shot at
Die
Live
Die
Live
0.1
0.04
10% of ducks get shot at during the duck shooting season – Of these 80% are killed. 4% of ducks not shot at, die of fright.
1st slide
Probability Starter 9 solns
1)
2)
5)
3)
4)
Copy & complete the probability tree
Find the probability of a duck being shot at & living
Find the probability of a duck living
70% of ducks who die when shot at are found by the hunter. What is the chance of this happening?
If a duck was shot at, what is the chance of a duck not being found by the hunter?
Shot at
Not shot at
Die
Live
Die
Live
0.1
0.8
0.04
10% of ducks get shot at during the duck shooting season – Of these 80% are killed. 4% of ducks not shot at, die of fright.
0.96
0.2
0.9
1st slide
Probability Starter 10
Design a simulation to find the chance of an injury on a rainy day
Tool:
Trial:
Record:
There is a 20% chance of a car crash on a rainy day. 45% of these crashes involve injury to the people in the car
Calculate:
1st slide