ISEE Middle Level Math : How to find the probability of an outcome

Study concepts, example questions & explanations for ISEE Middle Level Math

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Example Questions

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Example Question #54 : Develop And Compare Probability Models And Find Probabilities Of Events: Ccss.Math.Content.7.Sp.C.7

In a dice game, what is the probability of rolling a factor of 6 on a six-sided die?

Possible Answers:

Correct answer:

Explanation:

To find the probability of an event, we will use the following formula:

 

Now, given the event of rolling a factor of 6 on a dice, we can calculate the following:

because there are 4 factors of 6 on a dice:

  • 1
  • 2
  • 3
  • 6

 

Now, we can calculate the following:

because there are 6 possible outcomes we could potentially get when rolling a dice:

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6

 

Knowing this, we can substitute into the formula.  We get

 

Therefore, the probability of rolling a factor of 6 on a dice is .

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