Probability of Chance Events Word Problems (Grade 7)

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Probability of Chance Events Word Problems

1. 
A class contains 12 boys and 14 girls. The teacher calls on a student at random to go to the board. The probability that it is a girl is [math]7//13[/math].
  1. True
  2. False
2. 
Teresa has 8 white pom-poms and 7 orange pom-poms in a bag. If she removes an orange pom-pom and does NOT return it to the bag, the probability that the next chosen pom-pom at random is white is [math]4//7[/math].
  1. True
  2. False
3. 
A fair numbered cube with faces numbered 1 to 6 is rolled. The probability that a number other than 6 is rolled is [math]5//6[/math].
  1. True
  2. False
4. 
In a game, Charlie is rolling a dice. Which best describes the probability of rolling an even number?
  1. Not Possible
  2. The same as the probability of rolling an odd number
  3. Less than the probability of rolling an odd number
  4. Greater than the probability of rolling an odd number
5. 
A student is randomly selected from a class of 32 students. What is the probability that the selected student is a boy, if there are 20 girls in the class?
  1. 0.75
  2. 0.25
  3. 0.425
  4. 0.375
6. 
Hernando placed 5 green crayons, 6 blue crayons, and 9 yellow crayons in a container. He will reach in and pull one out without looking. What is the probability that the crayon he chooses will be green?
  1. [math]0.20[/math]
  2. [math]0.25[/math]
  3. [math]0.30[/math]
  4. [math]0.33[/math]
7. 
Five puppies are randomly selected for a test on behavior out of a group of 10 puppies. The puppies are selected one at a time and not returned to the group till after all the testing is done. If 60% of puppies are male, what is the probability that the first three puppies selected are female?
  1. [math]2.25%[/math]
  2. [math]3.33%[/math]
  3. [math]5.66%[/math]
  4. [math]8.50%[/math]
8. 
Timmy has 3 red pens and 2 black pens in the bottom of his book bag. They are all the same size and shape. He randomly selects a pen to use and then puts it back in his bag. Later he randomly selects a pen a second time. What is the probability that he selects a red pen both times?
  1. [math]3//5[/math]
  2. [math]3//10[/math]
  3. [math]1//9[/math]
  4. [math]9//25[/math]
9. 
A quarter is tossed two times. What is the probability that the coin will land heads up both times?
  1. 1
  2. 0.75
  3. 0.25
  4. 0.5
10. 
Morgan has a bag with 7 red jelly beans and 3 black jelly beans. He will randomly select one at a time and eat it. If the first jelly bean he selects is black, what is the probability that the second one will also be black?
  1. [math]1//5[/math]
  2. [math]2//9[/math]
  3. [math]3//7[/math]
  4. [math]3//10[/math]

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