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

The video tutorial explains a probability question involving a biased dice. It covers calculating the missing probability for the dice landing on 1, estimating the number of times the dice will land on 1 or 3 when rolled 200 times, and understanding probability operations for either-or situations. The tutorial emphasizes that all probabilities must add up to one and provides a step-by-step guide to solving the problem, including the allocation of marks for each step.

What is the first step in solving a probability problem involving a biased dice?

• Roll the dice multiple times.

• Ensure all probabilities add up to one.

• Guess the missing probability.

• Calculate the total number of outcomes.

How do you find the missing probability in a probability table?

• Add all known probabilities and subtract from one.

• Multiply all known probabilities.

• Divide the total number of outcomes by known probabilities.

• Guess the missing probability.

What is the probability of the dice landing on one or three?

• 0.17

• 0.31

• 0.49

• 0.69

How do you estimate the number of times a dice lands on a specific number?

• Subtract the probability from the number of rolls.

• Divide the number of rolls by the probability.

• Add the probability to the number of rolls.

• Multiply the probability by the number of rolls.

What is the expected number of times the dice lands on one or three when rolled 200 times?

• 49

• 98

• 69

• 31

Which operation is used for 'either/or' probability situations?

• Division

• Addition

• Multiplication

• Subtraction

What should you remember about probabilities in a table?

• They should be less than one.

• They should add up to one.

• They should all be different.

• They should be more than one.