Course: Lumos StepUp - Grade 7 Math
Lesson: Understanding Probability
Mary has 3 red marbles and 7 yellow marbles in a bag. If she were to remove 2 red and 1 yellow
marbles and set them aside, what is the probability of her pulling a yellow marble as her next
marble?
1
A)
6
1
B)
7
7
C)
10
6
D)
7
Standard: 7.SP.C.5
Domain: Statistics & Probability
Theme: Investigate chance processes and develop, use, and evaluate probability models
Description: Understand that the probability of a chance event is a number between 0 and 1 that expresses
the likelihood of the event occurring. Larger numbers indicate greater likelihood. A probability near 0
indicates an unlikely event, a probability around 1/2 indicates an event that is neither unlikely nor likely, and
a probability near 1 indicates a likely event.
© Lumos Information Services 2016
http://www.lumoslearning.com/
Page 1 of 5
Course: Lumos StepUp - Grade 7 Math
Lesson: Understanding Probability
Cameron has 3 red marbles and 7 yellow marbles in a bag. If he were to pull a single red marble out
and set it aside, which is the probability that he will select a red marble from the bag?
2
A)
9
7
B)
9
1
C)
3
3
D)
10
Standard: 7.SP.C.5
Domain: Statistics & Probability
Theme: Investigate chance processes and develop, use, and evaluate probability models
Description: Understand that the probability of a chance event is a number between 0 and 1 that expresses
the likelihood of the event occurring. Larger numbers indicate greater likelihood. A probability near 0
indicates an unlikely event, a probability around 1/2 indicates an event that is neither unlikely nor likely, and
a probability near 1 indicates a likely event.
© Lumos Information Services 2016
http://www.lumoslearning.com/
Page 2 of 5
Course: Lumos StepUp - Grade 7 Math
Lesson: Understanding Probability
Mary has 3 red marbles and 7 yellow marbles in a bag. If she were to pull two marbles out of the bag
one at a time (without replacement), what is the probability that both are red?
1
A)
15
6
B)
42
1
C)
10
D) It is not possible to pull two red marbles.
Standard: 7.SP.C.5
Domain: Statistics & Probability
Theme: Investigate chance processes and develop, use, and evaluate probability models
Description: Understand that the probability of a chance event is a number between 0 and 1 that expresses
the likelihood of the event occurring. Larger numbers indicate greater likelihood. A probability near 0
indicates an unlikely event, a probability around 1/2 indicates an event that is neither unlikely nor likely, and
a probability near 1 indicates a likely event.
© Lumos Information Services 2016
http://www.lumoslearning.com/
Page 3 of 5
Course: Lumos StepUp - Grade 7 Math
Lesson: Understanding Probability
Cathy has 3 red marbles and 7 yellow marbles in a bag. If she were to pull four marbles out of the
bag, what is the probability that all four are red?
A) 0
3
B)
7
81
C)
2401
1
D)
2
Standard: 7.SP.C.5
Domain: Statistics & Probability
Theme: Investigate chance processes and develop, use, and evaluate probability models
Description: Understand that the probability of a chance event is a number between 0 and 1 that expresses
the likelihood of the event occurring. Larger numbers indicate greater likelihood. A probability near 0
indicates an unlikely event, a probability around 1/2 indicates an event that is neither unlikely nor likely, and
a probability near 1 indicates a likely event.
© Lumos Information Services 2016
http://www.lumoslearning.com/
Page 4 of 5
Course: Lumos StepUp - Grade 7 Math
Lesson: Understanding Probability
John has a deck of cards (52 cards). If John removes a number 2 card from the deck, what is the
probability that he will pick a number 2 card at random?
A) 3 out of 51
B) 4 out of 51
C) 26 out of 51
D) 30 out of 51
Standard: 7.SP.C.5
Domain: Statistics & Probability
Theme: Investigate chance processes and develop, use, and evaluate probability models
Description: Understand that the probability of a chance event is a number between 0 and 1 that expresses
the likelihood of the event occurring. Larger numbers indicate greater likelihood. A probability near 0
indicates an unlikely event, a probability around 1/2 indicates an event that is neither unlikely nor likely, and
a probability near 1 indicates a likely event.
© Lumos Information Services 2016
http://www.lumoslearning.com/
Page 5 of 5