Envision Math 2.0: Grade 7, Volume 2
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Envision Math 2.0: Grade 7, Volume 2 View details
2. Understand Theoretical Probability
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Exercise 4 Page 364

1/6

Practice makes perfect
When calculating probability, we are comparing the number of favorable outcomes to the number of possible outcomes. To calculate the probability of rolling a 4 we will use the Probability Formula.

P=Favorable Outcomes/Possible Outcomes On every side of a six-sided number cube we have a different number from 1 to 6. Therefore, rolling a six-sided number cube has 6 possible outcomes — one per each side. Out of 6 sides only 1 side has a number 4. We have only 1 favorable outcome. Now we have enough information to calculate P(rolling a 4). P=Favorable Outcomes/Possible Outcomes ⇓ P(rolling a 4)=1/6 The probability of rolling a 4 is 16, which can also be written as 1:6.