GCSE Secondary Maths Age 13-17 - Probability & Statistics: Probability - Explained

The video tutorial covers a probability question from a June 2017 exam paper. It explains how to fill in a probability table, calculate missing probabilities, and estimate outcomes for dice rolls. The tutorial emphasizes the importance of practice and provides techniques for handling either-or probability situations. It concludes with a summary of key points and the allocation of marks for the question.

Why is practice emphasized as crucial in mastering probability questions?

• It guarantees a perfect score.

• It reduces the time needed for calculations.

• It ensures understanding of concepts.

• It helps in memorizing answers.

What must the sum of all probabilities in a probability table equal?

• 2

• It varies depending on the situation.

• 1

• 0.5

If a probability table is missing a value, how can it be found?

• By guessing based on other values.

• By dividing the sum of known probabilities by 2.

• By adding all known probabilities.

• By subtracting the sum of known probabilities from 1.

How do you calculate the probability of a dice landing on either one or three?

• Divide the probability of one by three.

• Subtract the probability of one from three.

• Multiply the probabilities of one and three.

• Add the probabilities of one and three.

What is the estimated number of times a dice will land on one or three if rolled 200 times with a probability of 0.49?

• 100 times

• 49 times

• 200 times

• 98 times

In probability, what operation is used for 'either/or' situations?

• Subtraction

• Addition

• Multiplication

• Division

What should you do when calculating the probability of two independent events both occurring?

• Subtract their probabilities.

• Add their probabilities.

• Divide their probabilities.

• Multiply their probabilities.