Probability Problems and Solutions

This video tutorial by Rob covers basic probability concepts through practical examples. It explains how to calculate probabilities in different scenarios, such as flipping a coin, rolling a die, spinning a spinner, and picking marbles from a bag. Each example demonstrates how to express probability as a fraction, decimal, and percentage, and discusses the likelihood of events. The tutorial also covers simplifying fractions and visualizing probabilities on a probability line.

What is the probability of flipping heads on a coin expressed as a percentage?

• 75%

• 100%

• 50%

• 25%

If you roll a standard 6-sided die, what is the probability of rolling a 2?

• 1/6

• 1/3

• 1/4

• 1/2

What is the probability of spinning a 5 on a spinner with 10 equally sized sectors?

• 1/3

• 1/2

• 1/10

• 1/5

How would you express the probability of spinning a 5 as a decimal?

• 0.05

• 0.1

• 0.5

• 0.2

What is the probability of randomly choosing a red marble from a bag with 3 red and 1 blue marble?

• 1/2

• 3/4

• 1/4

• 1/3

On a spinner with 8 sectors, what is the probability of landing on sector 8?

• 1/6

• 1/4

• 1/8

• 1/2

What is the probability of spinning a gray sector on a spinner with 3 gray and 5 white sectors?

• 3/8

• 5/8

• 1/2

• 1/3

In a bag of 12 marbles, what is the probability of picking a black marble if there are 5 black marbles?

• 1/4

• 5/12

• 1/2

• 1/3

What is the simplified probability of picking a gray marble from a bag with 4 gray marbles out of 12?

• 1/2

• 1/3

• 1/4

• 1/6

What is the probability of picking either a white or gray marble from a bag with 7 such marbles out of 12?

• 7/12

• 5/12

• 1/2

• 3/4