Math 7H - Probability

Math 7H - Probability

Would you do take this offer?

Your friend has a box of 50 markers. Only three of them are yellow. Your friend says she'll give you $10 if you pull out the yellow marker (without looking). But you owe her $10 if you don't pull out the yellow one.

Sample Space

The sample space is a list of all the possible outcomes of a random experiment.

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Ex. The sample space of flipping a coin is:

• Heads

• Tails​

Probability - Day 1

Multiple Choice

What is the sample space when rolling a regular number cube?

• 1

• 2, 4, 6

• 1, 2, 3, 4, 5, 6

• 6

Multiple Choice

What is the sample space for the jar of marbles?

• red

• red, yellow, green, blue

• red and yellow

• red and green

Multiple Choice

What is the sample space for the spinner shown?

• {yellow}

• {yellow and blue}

• {red and green}

• {yellow, blue, green, red}

Multiple Choice

What is sample space?

• a process with an uncertain result

• a possible result of an action

• a list of all possible outcomes of an event

• a single outcome or group of outcomes

Probability

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- the chance that an event is going to happen.

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​- can be expressed using words or a number.

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Probability - Day 1

Using words (also know as likelihood)

- How likely is it that an event is going to happen?

- Use words:

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• ​impossible

• unlikely

• even chance

• likely

• certain

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Probability - Day 1

Probability - Day 1

Probability (using a value)

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​**Written as a fraction, decimal, or percent.

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Ex. Coin is flipped

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P(heads) = ½, 0.5, 50%​

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Multiple Choice

What is the probability of the spinner landing on red?

• 5/12

• 1/5

• 5/5

• 3/5

Multiple Choice

What is the probability of spinning green?

• 0

• 1/4

• 1/2

• 3/4

Multiple Choice

A bag has 3 red marbles, 2 blue and 4 yellow. What is the probability of pulling a red (in simplest form)?

• 3/10

• 3/9

• 1/9

• 1/3

Multiple Choice

Ben has a basket of 5 red balls, 3 yellow balls, and 2 green balls. What is the probability that the probability he randomly chooses will be red?

• 1/2

• 1/5

• 1/10

• 5/8

Multiple Choice

P(not A)

• 5/8

• 3/4

• 2/8

• 1/4

Multiple Choice

What is the probability of rolling an even number on a standard number cube?

• impossible

• unlikely

• equally likely

• likely

Multiple Choice

What is the probability of pulling a red marble
out of a jar of marbles that have 10 green marbles, 7 red marbles and 3 blue marbles?

• 1/7

• 7/20

• 7/10

• 3/10

Multiple Choice

A regular 6-sided number cube is to be rolled once. What is the probability that a number less than 3 is rolled?

• 1/3

• 1/6

• 1/2

• 2/3

Multiple Choice

A jar contains 2 pink, 6 red, and 4 blue marbles. If you pick one marble without looking, what is the probability that the marble you pick will be red or blue?

• 5/6

• 1/2

• 1/3

• 1/6