# The probability scale

> Grade 7: probabilities from 0 to 1, equally likely outcomes, probability as a fraction, probability of an event not happening, experimental results.

Source: https://olyclass.com/library/math-g7-probability-scale-en/

- Subject: Math
- Level: Grade 7
- Practice: 16
- Play it free on one screen (projector, TV or whiteboard): https://olyclass.com/library?play=math-g7-probability-scale-en
- Copy and edit it: https://olyclass.com/library?copy=math-g7-probability-scale-en
- Games it plays well in: [Tile Grab](https://olyclass.com/classroom-games/tile-grab/), [Dare Board](https://olyclass.com/classroom-games/dare-board/), [Prize Climb](https://olyclass.com/classroom-games/prize-climb/), [Ring the Bell](https://olyclass.com/classroom-games/ring-the-bell/)

## Questions

1. Which number describes an event that is impossible? (0 / 0.5 / 1 / 10)
   Answer: 0
2. Which probability describes an event that is certain to happen? (0 / 0.5 / 1 / 100)
   Answer: 1
3. A probability can never be greater than 1.
   Answer: True
4. Which event has an even chance of happening? (Getting heads when you flip a fair coin / Rolling a 5 or 6 on a fair die / Rolling a 6 on a fair die / Rolling a number less than 7 on a die)
   Answer: Getting heads when you flip a fair coin
5. A fair die is rolled. What is the probability of getting a 4? (1/3 / 1/4 / 1/6 / 4/6)
   Answer: 1/6
6. A bag has 3 red and 5 blue counters. One is picked at random. P(red) = ? (1/3 / 3/5 / 3/8 / 5/8)
   Answer: 3/8
7. A fair die is rolled. What is the probability of an even number? (1/2 / 1/3 / 1/6 / 2/3)
   Answer: 1/2
8. If P(rain) = 0.3, then the probability of no rain is 0.7.
   Answer: True
9. The probability that a bus is late is 2/5. What is the probability it is not late? (1/5 / 2/5 / 3/5 / 5/3)
   Answer: 3/5
10. The chance of winning a game is 0.65. What is the chance of not winning?
   Answer: 0.35
11. A spinner has 5 equal sections numbered 1 to 5. P(number greater than 3) = ? (1/5 / 2/3 / 2/5 / 3/5)
   Answer: 2/5
12. If you flip a fair coin 10 times, you must get exactly 5 heads.
   Answer: False
13. A coin lands heads 20 times in 50 flips. What is the experimental P(heads)? (1/2 / 2/5 / 20/30 / 3/5)
   Answer: 2/5
14. A bag has 4 green and 6 yellow sweets. What is P(not green) as a fraction?
   Answer: 6/10 (or 3/5)
15. A drawing pin is dropped 40 times and lands point up 10 times. Experimental P(point up)?
   Answer: 1/4 (or 0.25)
16. A bag has 12 counters. P(blue) = 1/3. How many counters are blue? (3 / 4 / 6 / 9)
   Answer: 4