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Common Core: 7th Grade Math : Develop a Uniform Probability Model by Assigning Equal Probability to all Outcomes: CCSS.Math.Content.7.SP.C.7a

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All Common Core: 7th Grade Math Resources

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Example Questions

Example Question #11 : Develop A Uniform Probability Model By Assigning Equal Probability To All Outcomes: Ccss.Math.Content.7.Sp.C.7a

Samantha has a bag of marbles containing pink marbles, orange marble, red marbles, purple marbles, white marbles, black marble, green marbles, and yellow marble. What is the probability that Samantha will pick a green marble out of the bag?

Possible Answers:

$\frac{4}{18}$

$\frac{2}{19}$

$\frac{2}{18}$

$\frac{1}{19}$

$\frac{4}{19}$

Correct answer:

$\frac{4}{19}$

Explanation:

In this problem we have a total of marbles. That means that each marble, regardless of color, has a $\frac{1}{19}$ chance of being picked, as shown in the images below. This image shows equal probability because each marble has a $\frac{1}{19}$ chance of being drawn, which is equal to the probability of all of the other marbles.

Samantha wants to know what her probability is of drawing a green marble out of her bag. Remember, probability is the number of favorable outcomes over the total number of outcomes:

$\textup{P}=\frac{\textup{favorable outcomes}}{\textup{total outcomes}}$

For this problem there are green marbles; therefore,

$\textup{P(green marble)}=\frac{4}{19}$

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Example Question #12 : Develop A Uniform Probability Model By Assigning Equal Probability To All Outcomes: Ccss.Math.Content.7.Sp.C.7a

Possible Answers:

$\frac{1}{19}$

$\frac{1}{17}$

$\frac{2}{19}$

$\frac{1}{18}$

$\frac{3}{19}$

Correct answer:

$\frac{1}{19}$

Explanation:

Samantha wants to know what her probability is of drawing a yellow marble out of her bag. Remember, probability is the number of favorable outcomes over the total number of outcomes:

$\textup{P}=\frac{\textup{favorable outcomes}}{\textup{total outcomes}}$

For this problem there is yellow marble; therefore,

$\textup{P(yellow marble)}=\frac{1}{19}$

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Common Core: 7th Grade Math : Develop a Uniform Probability Model by Assigning Equal Probability to all Outcomes: CCSS.Math.Content.7.SP.C.7a

Study concepts, example questions & explanations for Common Core: 7th Grade Math

All Common Core: 7th Grade Math Resources

Example Questions

Example Question #11 : Develop A Uniform Probability Model By Assigning Equal Probability To All Outcomes: Ccss.Math.Content.7.Sp.C.7a

Example Question #12 : Develop A Uniform Probability Model By Assigning Equal Probability To All Outcomes: Ccss.Math.Content.7.Sp.C.7a

All Common Core: 7th Grade Math Resources

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