Understanding Probability Concepts

What fraction of the marbles in the bag are blue?

• Three-fourths

• One-third

• One-half

• Two-thirds

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

• 1

• 0.75

• 0

• 0.5

If an event has a probability of 0.5, what does this mean?

• It is impossible

• It is very likely

• It is certain

• It is equally likely to occur or not occur

How would you represent 0.75 on a number line divided into four equal parts?

• Four parts

• Two parts

• Three parts

• One part

Which of the following is equivalent to 75%?

• 1

• 0.5

• 0.25

• 0.75

If one-third of the marbles are blue, what fraction of the marbles are green?

• One-half

• Two-thirds

• Three-fourths

• One-third

What is the sum of the probabilities of all possible outcomes?

• 0

• 1

• 0.5

• 2

How do you calculate the probability of an unknown event?

• Multiply the probabilities of known events

• Add the probabilities of known events

• Divide the probability of known events by two

• Subtract the probability of known events from one

What is the algebraic method to find the probability of a green marble?

• Add one-third to one

• Multiply one-third by two

• Subtract one-third from one

• Divide one-third by two

What is the probability of selecting a green marble if the probability of selecting a blue marble is one-third?

• One-third

• One-half

• Three-fourths

• Two-thirds