1. The Probability of an event NOT Happening
I have a box of 7 different CDs, 3 are music CDs.
What is the probability of NOT picking a music CD?
In how many ways can I NOT pick a music DVD?
4/7

2. The Probability of an event NOT Happening
Question: What is the relationship between P(Music CD) = 3/7 and P(NOT Music CD) = 4/7 ? They add up to 1  𝟑 𝟕 + 𝟒 𝟕 = 𝟕 𝟕 =𝟏 P(NOT Music CD) = 1 – P(Music CD) = 7/7 – 3/7 = 4/7 IN GENERAL The probability of an event NOT happening is found by deducting from 1 the probability of that event happening! (finding the COMPLEMENT!)
Minn kollha han nehhi 3 (kollha = 7/7 = 1

3. Probability of an event not happening
1 – Probability of EVENT happening
Worksheet

4. Probability - Find the probability of things NOT happening
10 multiple choice questions

5. 1 out of 8 A) B) C) D) evens unlikely 7 out of 8 1 out of 8
If the Probability of an event happening is:
1 out of 8
What is the probability of the event NOT happening?
evens
unlikely A) B)
7 out of 8
1 out of 8 C) D)

6. 3 out of 7 A) B) C) D) likely 4 out of 7 3 out of 7 7 out of 3
If the Probability of an event happening is:
3 out of 7
What is the probability of the event NOT happening?
likely
4 out of 7 A) B)
3 out of 7
7 out of 3 C) D)

7. 13 out of 20 A) B) C) D) 20 out of 13 unlikely 7 out of 10 7 out of 20
If the Probability of an event happening is:
13 out of 20
What is the probability of the event NOT happening?
20 out of 13
unlikely A) B)
7 out of 10
7 out of 20 C) D)

8. If the Probability of an event happening is:
0.2
What is the probability of the event NOT happening?
0.8
99.8 A) B)
0.18
0.2 C) D)

9. If the Probability of an event happening is:
0.6
What is the probability of the event NOT happening?
0.7
0.3 A) B)
0.5
0.4 C) D)

10. If the Probability of an event happening is:
0.85
What is the probability of the event NOT happening?
0.20
0.15 A) B)
0.2
0.25 C) D)

11. If the Probability of an event happening is:
0.25
What is the probability of the event NOT happening?
0.65
0.75 A) B)
0.85
0.70 C) D)

12. If the Probability of an event happening is:
0.44
What is the probability of the event NOT happening?
0.55
0.46 A) B)
0.66
0.56 C) D)

13. If the Probability of an event happening is:
0.01
What is the probability of the event NOT happening?
0.9
0.09 A) B)
0.99
0.999 C) D)

14. If the Probability of an event happening is:
0.97
What is the probability of the event NOT happening?
0.03
0.13 A) B)
0.3 3 C) D)

15. A bag contains blue, red and green cards only
A bag contains blue, red and green cards only. One card is taken at random from the bag. The table shows the probabilities of taking a blue card and a red card. Fill in the gap:
Colour
Blue
Red
Green
Probability
2 5 𝑜𝑟 0.4
1 2 𝑜𝑟 0.5
𝟏 𝟏𝟎 𝒐𝒓 𝟎.𝟏

16. The probability of each student being picked for a race is given below
The probability of each student being picked for a race is given below. Fill in the gap!
Name
Josh
Brian
Matt
Luke
David
Probability
0.32
0.1
0.21
0.31
0.06

17. Pg 43-44 Exercise 2a No. 13-16 (all parts please)
Homework
Pg Exercise 2a No (all parts please)