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McGraw Hill Glencoe Algebra 1, 2012

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McGraw Hill Glencoe Algebra 1, 2012 View details

11. Simple Probability and Odds

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Exercise 9 Page p36

Use the Probability Formula.

$\frac{2}{3}$

To calculate the probability of choosing not a quadrilateral, we use the Probability Formula.

P = \frac{Number of favorable outcomes}{Number of possible outcomes}

In our exercise the number of possible outcomes is

6,

as we have six polygons. Among them four are not quadrilaterals, so the number of favorable outcomes is

4 .

Now we can calculate

P (not a quadrilateral) .

P = \frac{Number of favorable outcomes}{Number of possible outcomes}

SubstituteValues

Substitute values

P (not a quadrilateral) = \frac{4}{6}

$\frac{a}{b} = \frac{a / 2}{b / 2}$

P (not a quadrilateral) = \frac{2}{3}

The probability of picking a figure that is not quadrilateral is

\frac{2}{3} .