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Ninth Grade (Grade 9) Represent and Determine Probability Questions

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Grade 9 Represent and Determine Probability CCSS: HSS-CP.A.1
A class has 11 boys and 9 girls. Two of the students will be selected at random to serve on a committee. What is the probability that both of the selected students will be girls?
  1. [math]72/400[/math]
  2. [math]18/95[/math]
  3. [math]81/380[/math]
  4. [math]81/121[/math]
Grade 9 Represent and Determine Probability
When dealing cards from a regular deck, what is the probability that the first card you deal will not be an ace?
  1. 48/52 = 12/13
  2. 4/52 = 1/13
  3. 51/52
  4. 100%
Grade 9 Represent and Determine Probability
The best definition for dependent events is
  1. a letter that represents a number.
  2. what you look for in a probability experiment.
  3. when one result does not affect another.
  4. when the first outcome affects the next one.
Grade 9 Represent and Determine Probability
The best definition for dependent events is
  1. the chance something will happen.
  2. the outcome of one event does not affect the outcome of another.
  3. the outcome of one event does affect the outcome of another.
  4. an arrangement of objects in a certain order.
Grade 9 Represent and Determine Probability
The best definition for independent events is
  1. the chance something will happen.
  2. the outcome of one event does not affect the outcome of another.
  3. the outcome of one event does affect the outcome of another.
  4. an arrangement of objects in a certain order.
Grade 9 Represent and Determine Probability
If you toss a coin 25 times, what is the sample size?
  1. 100
  2. 75
  3. 25
  4. 1
Grade 9 Represent and Determine Probability
Which of the following are independent events? There may be more than one correct answer.
  1. Rolling two dice.
  2. Picking three cards from a deck of cards, one at a time, keeping each one.
  3. Tossing a coin three times.
  4. Rolling one die, two times.
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