Common Core: 7th Grade Math : Statistics & Probability

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

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Example Questions

Example Question #141 : Statistics & Probability

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 white marble out of the bag?

 

Possible Answers:

Correct answer:

Explanation:

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

1

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

For this problem there are  white marbles; therefore, 

Example Question #141 : Statistics & Probability

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 red marble out of the bag?

 

Possible Answers:

Correct answer:

Explanation:

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

1

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

For this problem there are  red marbles; therefore, 

Example Question #8 : 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 purple marble out of the bag?

 

Possible Answers:

Correct answer:

Explanation:

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

1

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

For this problem there are  purple marbles; therefore, 

Example Question #9 : 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 black marble out of the bag?

 

Possible Answers:

Correct answer:

Explanation:

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

1

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

For this problem there is  black marble; therefore, 

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:

Correct answer:

Explanation:

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

1

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:

For this problem there are  green marbles; therefore, 

Example Question #12 : 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 yellow marble out of the bag?

 

Possible Answers:

Correct answer:

Explanation:

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

1

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:

For this problem there is  yellow marble; therefore, 

Example Question #851 : Grade 7

Joe has a bag of  marbles:  red marbles, , yellow marbles, and  blue marbles. If the first marble he draws is a red marble, then what is the probability that he will draw a blue marble on his second try? 

 

Possible Answers:

Correct answer:

Explanation:

Joe starts out with  marbles, and  of the marbles are blue. This means that the probability of Joe drawing a blue marble from the bag on his first attempt is 

Now that Joe has taken a red marble from the bag, we still have  blue marbles left, but only a total of  marbles left in the bag; thus, the probability of Joe drawing a blue marble on his second attempt is 

Example Question #1 : Understand Fraction Of Outcomes: Ccss.Math.Content.7.Sp.C.8a

Dan has a bag of  marbles:  red marbles, , yellow marbles, and  blue marbles,  purple marble, and  orange. If the first marble he draws is a purple marble, then what is the probability that he will draw a red marble on his second try? 

 

 

Possible Answers:

Correct answer:

Explanation:

Dan starts out with  marbles, and  of the marbles are red. This means that the probability of Dan drawing a blue marble from the bag on his first attempt is 

Now that Dan has taken a purple marble from the bag, we still have  red marbles left, but only a total of  marbles left in the bag; thus, the probability of Dan drawing a red marble on his second attempt is 

Example Question #3 : Understand Fraction Of Outcomes: Ccss.Math.Content.7.Sp.C.8a

Joe has a bag of  marbles:  red marbles, , yellow marbles, and  blue marbles. If the first marble he draws is a red marble, then what is the probability that he will draw another red marble on his second try? 

Possible Answers:

Correct answer:

Explanation:

Joe starts out with  marbles, and  of the marbles are red. This means that the probability of Joe drawing a red marble from the bag on his first attempt is 

Now that Joe has taken a red marble from the bag, we have only  red marbles left, and a total of  marbles left in the bag; thus, the probability of Joe drawing a red marble on his second attempt is 

Example Question #4 : Understand Fraction Of Outcomes: Ccss.Math.Content.7.Sp.C.8a

Joe has a bag of  marbles:  red marbles, , yellow marbles, and  blue marbles. If the first marble he draws is a yellow marble, then what is the probability that he will draw another yellow marble on his second try? 

 

Possible Answers:

Correct answer:

Explanation:

Joe starts out with  marbles, and  of the marbles are yellow. This means that the probability of Joe drawing a yellow marble from the bag on his first attempt is 

Now that Joe has taken a yellow marble from the bag, we have only  yellow marbles left, and a total of  marbles left in the bag; thus, the probability of Joe drawing a yellow marble on his second attempt is 

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