1. L1 Probability Starters
Links
Probability Starter Probability Starter 1 Solns
Probability Starter Probability Starter 2 Solns
Probability Starter Probability Starter 3 Solns
Probability Starter Probability Starter 4 Solns
Probability Starter Probability Starter 5 Solns
Probability Starter Probability Starter 6 Solns
Probability Starter Probability Starter 7 Solns
Probability Starter Probability Starter 8 solns
Probability Starter Probability Starter 9 solns
Probability Starter 10 Probability Starter 10 solns A B C

2. Probability Starter 1 Favourite pets
1st slide
Favourite pets
Boys
Girls
Totals
Cat 12 8 20
Dog 16 14 30 28 22 50 1)
Find the probability of being a Boy 2)
Find the probability of a Dog being favourite pet 3)
Find the probability of being a Boy and having a Cat as favourite pet 4)
Find the probability that a Boy has a Cat as favourite pet 5)
Find the probability of being a girl, given that a dog is a favourite pet

3. Probability Starter 1 Solns
1st slide
Favourite pets
Boys
Girls
Totals
Cat 12 8 20
Dog 16 14 30 28 22 50 1)
Find the probability of being a Boy 2)
Find the probability of a Dog being favourite pet 3)
Find the probability of being a Boy and having a Cat as favourite pet 4)
Find the probability that a Boy has a Cat as favourite pet 5)
Find the probability of being a girl, given that a dog is a favourite pet

4. A B C Probability Starter 2 A simple lottery wheels is spun twice
1st slide A B C
A simple lottery wheels is spun twice 1)
Find the probability getting ‘A’ on both spins 2)
Find the probability spinning a ‘B’ or a ‘C’ 3)
Find the probability of spinning a pair the same 4)
Find the probability of the two spins being in alphabetical order 5)
Find the probability of spelling CAB in 3 spins

5. Probability Starter 2 Solns
1st slide A B C
A simple lottery wheels is spun twice 1)
Find the probability getting ‘A’ on both spins 2)
Find the probability spinning a ‘B’ or a ‘C’ 3)
Find the probability of spinning a pair the same 4)
Find the probability of the two spins being in alphabetical order 5)
Find the probability of spelling CAB in 3 spins

6. Probability Starter 3
1st slide
A shop runs a promotion with one of 5 cards given with each purchase (there are a very large number of cards) 1)
Find the probability getting a ‘star’ card first 2)
Find the probability of getting a yellow card first 3)
Find the probability of getting a blue card first, then a red card 4)
Find the probability of getting two stars in a row 5)
If you select a blue card, what's the chance it is a moon?

7. Probability Starter 3 Solns
1st slide
A shop runs a promotion with one of 5 cards given with each purchase (there are a very large number of cards) 1)
Find the probability getting a ‘star’ card first 2)
Find the probability of getting a yellow card first 3)
Find the probability of getting a blue card first, then a red card 4)
Find the probability of getting two stars in a row 5)
If you select a blue card, what's the chance it is a moon?

8. Two cards are selected at random from this hand
Probability Starter 4
1st slide
Two cards are selected at random from this hand 1)
Find the probability getting a red card first 2)
Find the probability of getting an Ace or Queen first 3)
Find the probability of getting a 4 first, then a 6 next 4)
Find the probability of getting two Queens 5)
If you select a Queen first, what's the chance of getting a Queen 2nd

9. Probability Starter 4 Solns
1st slide
Two cards are selected at random from this hand 1)
Find the probability getting a red card first 2)
Find the probability of getting an Ace or Queen first 3)
Find the probability of getting a 4 first, then a 6 next 4)
Find the probability of getting two Queens 5)
If you select a Queen first, what's the chance of getting a Queen 2nd

10. Probability Starter 5 Bill rolls a dice Ted rolls a dice
1st slide
Bill rolls a dice
Ted rolls a dice 1)
Find the probability of Bill getting a 4 OR 5 2)
Find the probability of Bill getting a 5 and Ted getting a 1 3)
Find the probability of Bill & Ted getting the same result 4)
Find the probability of Ted rolling a score greater than Bills roll 5)
Find the probability of Ted rolling twice Bills roll

11. Probability Starter 5 Solns
1st slide
Bill rolls a dice
Ted rolls a dice 1)
Find the probability of Bill getting a 4 OR 5 2)
Find the probability of Bill getting a 5 and Ted getting a 1 3)
Find the probability of Bill & Ted getting the same result 4)
Find the probability of Ted rolling a score greater than Bills roll 5)
Find the probability of Ted rolling twice Bills roll

12. Probability Starter 6 0.8 Late MTB crash 0.15 On time 0.05 No Late
1st slide
0.8
Late
MTB crash
0.15
On time
0.05 No
crash
Late
On time 1)
Copy & complete the probability tree 2)
Find the probability of MTB crash and being late 3)
Find the probability of being late 4)
Find the probability of being late IF there was no crash 5)
Given that I crash my MTB find the probability of being on time

13. Probability Starter 6 Solns
1st slide
0.8
Late
MTB crash
0.15
0.2
On time
0.85
0.05 No
crash
Late
0.95
On time 1)
Copy & complete the probability tree 2)
Find the probability of MTB crash and being late 3)
Find the probability of being late 4)
Find the probability of being late IF there was no crash 5)
Given that I crash my MTB find the probability of being on time

14. 2 5 4 3 Probability Starter 7 A numbered lottery spinner is spun twice
1st slide 2 5 4 3
A numbered lottery spinner is spun twice 1)
Find the probability of the first spin being a 4 2)
Find the probability of the two spins being the same number 3)
Find the probability of the two spins adding to 8 4)
Find the probability of the two spins adding to 7 5)
Find the probability the first spin being greater than the 2nd

15. Probability Starter 7 Solns
1st slide 2 5 4 3
A numbered lottery spinner is spun twice 1)
Find the probability of the first spin being a 4 2)
Find the probability of the two spins being the same number 3)
Find the probability of the two spins adding to 8 4)
Find the probability of the two spins adding to 7 5)
Find the probability the first spin being greater than the 2nd

16. Probability Starter 8
1st slide
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
0.8
Passed
Study
0.7
No Pass No
study
Passed 1)
Copy & complete the probability tree
No Pass 2)
Find the probability of doing no study & passing the test 3)
Find the probability of passing the test 4)
35% of people who study & pass the test get ‘merit’ What is the chance of this happening? 5)
What is the chance of passing and not getting a ‘merit’ given that a student did study for the test.

17. Probability Starter 8 solns
1st slide
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
0.8
Passed
Study
0.7
0.2
No Pass
0.3
0.45 No
study
Passed
0.55 1)
Copy & complete the probability tree
No Pass 2)
Find the probability of doing no study & passing the test 3)
Find the probability of passing the test 4)
35% of people who study & pass the test get ‘merit’ What is the chance of this happening? 5)
What is the chance of passing and not getting a ‘merit’ given that a student did study for the test.

18. Probability Starter 9
1st slide
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.
Die
Shot at
0.1
Live
0.04
Not shot at
Die 1)
Copy & complete the probability tree
Live 2)
Find the probability of a duck being shot at & living 3)
Find the probability of a duck living 4)
70% of ducks who die when shot at are found by the hunter. What is the chance of this happening? 5)
If a duck was shot at, what is the chance of a duck not being found by the hunter?

19. Probability Starter 9 solns
1st slide
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.
0.8
Die
Shot at
0.1
0.2
Live
0.9
0.04
Not shot at
Die
0.96 1)
Copy & complete the probability tree
Live 2)
Find the probability of a duck being shot at & living 3)
Find the probability of a duck living 4)
70% of ducks who die when shot at are found by the hunter. What is the chance of this happening? 5)
If a duck was shot at, what is the chance of a duck not being found by the hunter?

20. Probability Starter 10
1st slide
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
Design a simulation to find the chance of an injury on a rainy day
Tool:
Trial:
Record:
Calculate:

21. Probability Starter 10 solns
1st slide
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
Design a simulation to find the chance of an injury on a rainy day
Tool:
Trial:
Record:
Calculate: