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Glencoe Math: Course 2, Volume 2

GM

Glencoe Math: Course 2, Volume 2 View details

1. Probability of Simple Events

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Exercise 2 Page 715

Use the Probability Formula.

Fraction: 3/8
Decimal: 0.375
Percent: 37.5 %

Practice makes perfect

When calculating probability, we are comparing the number of favorable outcomes to the number of possible outcomes. To calculate the probability that a spun color is red or yellow we will use the Probability Formula. P=Favorable Outcomes/Possible Outcomes Let's take a look at the spinner.

The spinner has 8 sections, so the number of possible outcomes is 8. Out of these, 2 sections are red and 1 section is yellow. The number of favorable outcomes is 3. Now we have enough information to calculate P(red or yellow).

P=Favorable Outcomes/Possible Outcomes

SubstituteValues

Substitute values

P(red or yellow)=3/8

The probability of spinning red or yellow is 38. Next, we can rewrite the fraction as a decimal and as a percent.

As a Decimal

To write a fraction as a decimal, we divide the numerator by the denominator.

division

We found that 38 expressed as a decimal is 0.375.

As a Percent

To write a fraction as a percent, we first find an equivalent fraction with a denominator of 100. 3/8=p/100 Let's solve the equation for p.

3/8 = p/100

LHS * 100=RHS* 100

3/8* 100 =p/100* 100

FracMultDenomToNumber

a/100* 100 = a

3/8* 100 = p

Write as a decimal

0.375 * 100 = p

Multiply

37.5 = p

The fraction written as a percent is 37.5 %.

Subchapter links

Guided Practice p.714

Independent Practice p.715-716

H.O.T. Problems p.716

Standardized Test Practice p.716-718

Extra Practice p.717

Common Core Review p.718