Simple Probability

Presentation

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Mathematics

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7th Grade

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Practice Problem

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Medium

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CCSS

7.SP.C.6, HSS.CP.B.7, 7.SP.C.7A

Standards-aligned

Michelle Washington

Used 191+ times

FREE Resource

5 Slides • 7 Questions

Simple Probability

Possible Outcomes/Total Outcomes in simplest form

Ex. There are 4 red, 3 purple, and 2 pink jellybeans.

What's P(pink or red)?

Possible out of total= 6/9

Reduce to 2/3

Fill in the Blanks

There are 8 red, 2 blue, and 6 green marbles. What's P(blue or green)?

Type answer...

Fill in the Blanks

What's the probability of getting an even number on a die?

Type answer...

Fill in the Blanks

What is 4/5 as a %?

Type answer...

Finding theoretical probability

Find the possible outcomes out of the total outcomes
You may have to set up a proportion.
Ex: 1/3 of the marbles are blue. How many blue marbles would you expect to pick out of 27 marbles?
1/3=x/27
1x27 divided by 3

Multiple Choice

3 out of 5 m and m's are red. How many would you expect to have in a bag of 50?

Multiple Choice

The probability that a student guesses the correct answer to a five-choice multiple choice question is P(correct)=0.2. How many correct answers should a student expect to guess on a test with 40 five-choice multiple choice questions? (hint: find 20% of 40)

200 Cards were drawn. What's the relative frequency of getting 3 or 4?

Possible/ Total=40/200 which is 1/5.

Fill in the Blanks

What's the relative frequency of getting a number less than 3?( out of 200 cards)

Type answer...

% example

Based on the records for the past several seasons, a sports fan believes the probability the red team wins is 0.20. The fan also believes the probability the blue team wins is 0.22. In a season with 120 games, how many more games should the fan expect the blue team to win?

So figure out 20% of 120 .2x120=24

Then 22% of 120 .22x120=26.4

The blue team will be expected to win about 2 more games.

Fill in the Blanks

Based on the records for the past several seasons, a sports fan believes the probability the red team wins is 0.4. The fan also believes the probability the blue team wins is 0.3. In a season with 100 games, how many more games should the fan expect the red team to win?

Type answer...

Simple Probability

Possible Outcomes/Total Outcomes in simplest form

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