Y9 Probability Practice Quizizz 2

If there is a 90% chance of rain tomorrow, based on the given scale how would we describe the probability of it raining tomorrow?

• Likely

• Very Likely

• Highly Likely

• Certain

Answer explanation

If there is a 90% chance this equals 0.9 = highly likely

What words are missing in the image?

• Sample Space

• Outcomes

• Events

• Table

Answer explanation

Although it does show all of the possible outcomes, the correct word for this is a 'sample space'

If two coins are tossed, which of the following represents the correct sample space?

• A

• B

• C

• D

• E

Answer explanation

The sample space needs to show pairs of letters as there is two coins tossed, so for example one outcome is getting 2 heads. Think of the first letter as Coin 1 and the second letter as Coin 2. This is why we need HT and TH so the answer is D not A.

A circular spinner is spun with equal options labelled R, O, Y, G.

A 6-sided die is also rolled. Imagine drawing a two-way table sample space showing all the possible outcomes. What is the total number of outcomes?

• 10

• 6

• 38

• 24

Answer explanation

See the attached picture, this is the sample space. There is 6x4 answers so 24 altogether.

A spinner with equal options R, O, Y, G, B, I, V is spun. What are the options representing?

• Random animals

• Colours of the rainbow!

• A guy named Roygbiv

• Numbers

A spinner with equal options R, O, Y, G, B, I, V is spun. A coin is also tossed. Imagine drawing a two-way table as the sample space. How many outcomes are there in total?

A bag contains cards with the letters A, B and C. Two cards are drawn (with replacement of the

first card before drawing the second) and paired up. What outcome is missing from the sample space?

• AB

• AA

• BC

• CB

If a card was drawn from a shuffled pack of 52 cards, find the theoretical probability of selecting an ace (hint: there are 4 aces in a pack). Remember to simplify.

• 13

Answer explanation

The probability is 4/52 which we can halve both numbers = 2/26

and halve again

=1/13

If a coin is tossed 200 times, theoretically how many times is heads expected?

Answer explanation

Heads has 1/2 chance of happening so 1/2 x 200 = 100

• 20

• 40

• 60

• 10

Answer explanation

2/3 x 60

= 40