Back to Exercise: Understand that the probability of a chance event is a number between 0 and 1

Understanding Probability: The 0-to-1 Scale

Express probability answers as fractions, decimals, or percents. When asked to classify, use the labels: impossible, unlikely, equally likely/unlikely, likely, or certain.

Grade 7·21 problems·~35 min·Common Core Math - Grade 7·standard·7-sp-c-5

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Recall / Warm-Up

Which decimal is equal to $\frac{1}{4}$ ?

$0.14$

$0.25$

$0.4$

$4.0$

Which fraction is greater: $\frac{1}{3}$ or $\frac{1}{5}$ ?

$\frac{1}{5}$ , because 5 is greater than 3.

$\frac{1}{3}$ , because dividing 1 into fewer pieces makes each piece larger.

They are equal.

Cannot be determined without a common denominator.

Express 40% as a decimal.

Fluency

An event that cannot possibly happen has what probability?

$-1$

$0$

$\frac{1}{2}$

Any very small number close to 0

An event that will definitely happen has what probability?

$0$

Any number greater than $\frac{1}{2}$

$1$

A number slightly greater than 1

Complete the three anchor values on the probability scale: impossible = ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ; equally likely or unlikely = ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ; certain = ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ .

impossible:

equally likely/unlikely:

certain:

Which probability value indicates a likely event?

$0.1$

$0.3$

$0.5$

$0.85$

A bag contains 3 red marbles and 1 blue marble. You pick one marble without looking. What is the probability of picking a red marble?

$\frac{1}{4}$

$\frac{1}{3}$

$\frac{3}{4}$

$3$

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