Calculating Probability: Understanding Fractions, Decimals, and Percentages

This video tutorial explains how to calculate the probability of an event, using the example of selecting a green marble from a bag. It covers the probability continuum, common mistakes in converting between fractions, decimals, and percentages, and visualizing probabilities on a number line. The tutorial also demonstrates how to calculate the probability of an unknown event using algebraic methods, emphasizing the concept of making a sum of 1 for all possible outcomes.

What is the probability of an event that is certain to happen?

• 0.75

• 0.5

• 0

• 1

If a number line is divided into four equal parts, which fraction represents three of those parts?

• 1/3

• 1/2

• 3/4

• 1/4

In a bag of marbles, if 1/3 are blue, what fraction of the marbles are green?

• 1/4

• 1/2

• 1/3

• 2/3

How do you calculate the probability of an unknown event if you know the probability of other events?

• Divide the probabilities of known events

• Subtract the probabilities of known events from 1

• Multiply the probabilities of known events

• Add the probabilities of known events

What is the probability of picking a green marble if the probability of picking a blue marble is 1/3?

• 2/3

• 1/3

• 1/2

• 1