Lesson 1 - Probability

Probability

What is Probability?

Probability is...

..how likely something is to happen. You might also hear it called chance.

​Real Life

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​Random

​A measure of of how likely an event is to happen

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​

​Probability

​if a letter is picked at random from the letters of the alphabet means that every letter has an equal chance of being picked.

Probability can be expressed as:

fractions, decimals or percentages or on a probability scale.

Probability Scale

• Certain: an event will happen without a doubt

• Likely: the probability of one event is higher than the probability of another event

• Equal probability: the chance of each event happening is the same

• Unlikely: one event is less likely to happen versus another event

• Impossible: there's no chance of an event happening

​Get ready to answer some questions

The Probability Scale 

Multiple Choice

What is the probability of the spinner landing on a B

• Impossible

• Unlikely

• Even

• Certain

Multiple Select

What is the probability of the spinner landing on an F

• Impossible

• Unlikely

• Even

• Certain

Fill in the Blank

You will celebrate your 10th birthday tomorrow!

Multiple Choice

Which Arrow show the probability of rolling a number greater than a 2 on a dice?

• A

• B

• C

• D

Multiple Choice

What is the probability that

You will be struck by lightning tomorrow!

• Impossible

• Unlikely

• Even

• Certain

Hotspot

Answer the exam style question

Hotspot

Answer the exam style question.

Multiple Select

• 0.5

• 50%

• 1/2

• All of the above

Multiple Choice

What is the probability that

The next person you see in the corridor will be a male

• Impossible

• Unlikely

• Even

• Certain

Hotspot

Last one, Answer the exam style question.

Multiple Choice

What is the probability that

The sun will rise tomorrow morning!

• Impossible

• Unlikely

• Even

• Certain

Multiple Choice

What is the probability that

You will still be alive when you are 100

• Impossible

• Unlikely

• Even

• Certain

Multiple Choice

If you select a marble without looking, how likely is it that you will pick a black one?

• certain

• probable

• unlikely

• impossible

Multiple Choice

A box contains 2 red, 2 grey and 2 yellow balls

What is the probability of picking a red ball?

• 2/6

• 1/6

• Unlikely

Fill in the Blank

Another box contains 3 red, 2 green, 2 blue  and 1 yellow ball.

What is the probability of a randomly chosen ball being red?

/

Multiple Choice

Answer this probability question? what is the probability ta it will land point down?

• 15/50

• 15/35

• 35/50

• 40/60

Multiple Choice

If you select a marble without looking, how likely is it that you will pick a black one?

• certain

• probable

• unlikely

• impossible

Multiple Choice

Answer this probability question. What is the probability it will land head up?

• 27/50

• 27/33

• 33/60

• 27/60

Multiple Choice

If you flip a coin, what is the probability that it will land on heads?

• 1/4

• 1/8

• 1/2

• 1/3

Multiple Choice

Answer this probability question. What is the probability of the car being silver?

• 15/30

• 10/30

• 3/30

• 2/30

Multiple Choice

If you select a marble without looking, how likely is it that you will pick a black one?

• certain

• probable

• unlikely

• impossible

Multiple Choice

Answer this probability question. What is the probability of the car being black?

• 10/30

• 3/30

• 15/30

• 2/30

Multiple Choice

If you select a marble without looking, what is the probability that it will be blue?

• 1/3

• 2/5

• 1/6

• impossible

Multiple Choice

Last one of these, answer the question what is the probability of the car is not red?

• 28/30

• 10/30

• 15/30

• 27/30

Multiple Choice

If you roll a 6-sided die, what is the probability of rolling a two?

• 2/6

• 1/6

• 1/3

• 1/5

Multiple Choice

Which letter shows an even chance probability?

• A

• B

• E

• C

Multiple Choice

Which letter is point to 1/6?

• A

• B

• C

• D

Multiple Choice

What is the probability of selecting a green counter?

• 1/10

• 3/10

• 1/5

• 2/5

Multiple Choice

What is the probability of selecting a blue counter?

• 1/10

• 3/10

• 2/5

• 1/5

Multiple Choice

What is the probability of selecting a black counter?

• 1/5

• 0

• 3/10

• 2/5

Multiple Select

The diagram shows a spinner.

What is the probability of landing on red?

• 2/3

• 1/6

• 1/3

• 3/6

Multiple Choice

The diagram shows a spinner.

What is the probability of landing on blue?

• 1/2

• 1/4

• 1/6

• 5/6

Multiple Choice

A six sided dice is rolled once.

What is the probability of landing on a 6?

• 1/6

• 1/2

• 5/6

• 6

Multiple Choice

What is the probability of the spinner landing on an odd number?

• 1/3

• 4/4

• 4/8

• 1/4

Multiple Choice

Here is a list of 8 numbers.

1 , 2 , 3 , 4 , 5 , 6 , 8 , 9

A number is chosen at random. Write down the probability that this number is 9.

• 1/8

• 1/9

• 7/8

• 7/9

Multiple Choice

Angela has a 3-sided spinner.

The sides of the spinner are numbered 1, 2 and 3

Angela spins the spinner once.

Choose the word that best describes the probability that the spinner will land on a number less than 4

• Impossible

• Unlikely

• Even

• Likely

• Certain

Multiple Choice

Angela has a 3-sided spinner.

The sides of the spinner are numbered 1, 2 and 3

Angela spins the spinner once.

Choose the word that best describes the probability that the spinner will land on the number 4.

• Impossible

• Unlikely

• Even

• Likely

• Certain

Multiple Choice

Meela has a fair 6-sided spinner.

The sides of the spinner are numbered 2, 2, 2, 3, 3, 5

Meela spins the spinner once.

Which number is the spinner least likely to land on?

• 1

• 2

• 3

• 4

• 5

Multiple Choice

Meela has a fair 6-sided spinner.

The sides of the spinner are numbered 2, 2, 2, 3, 3, 5

From the following list, choose the word that best describes the likelihood that the spinner will land on 2

• Impossible

• Unlikely

• Even

• Likely

• Certain

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