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Big Ideas Math: Modeling Real Life, Grade 7

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Big Ideas Math: Modeling Real Life, Grade 7 View details

Practice Test

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Exercise 6 Page 318

Experimental probability of an event is the number of times the event occurs divided by the total number of trials.

7/15 or 46 23 %

When calculating the experimental probability, we are comparing the number of times the event occurs to the number of trials. P=Number of Times the Event Occurs/Number of Trials If we roll a number cube, we can roll six different outcomes. The sum of the frequencies of these outcomes is the total number of trials. Let's add them! 12+18+14+17+16+13= 90 Rolling an odd number means rolling a 1, 3, or 5. The sum of the frequencies of these outcomes is the number of times the event occured. 12+14+16= 42 Now we have enough information to calculate P(odd).

P=Times the Event Occurs/Number of Trials

SubstituteValues

Substitute values

P(odd)=42/90

a/b=.a /6./.b /6.

P(odd)=7/15

Calculate quotient

P(odd)=0.466666...

Convert to percent

P(odd)=46.666666... %

Write as a sum

P(odd)=(46+0.666666...) %

Write as a fraction

P(odd)=(46+2/3) %

Add terms

P(odd)=46 23 %

The probability of spinning an odd number is 715, which can also be written as 46 23 % .

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