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

The video tutorial explains a probability question involving drawing counters from a bag without replacement. It covers calculating the probability of drawing one green and one blue counter in two different sequences: green then blue, and blue then green. The tutorial demonstrates how to combine these probabilities using addition and explains the marking scheme for the question, emphasizing the importance of understanding non-replacement situations.

What is the total number of counters in the bag?

• 7

• 9

• 11

• 5

How many green counters are there in the bag?

• 8

• 5

• 6

• 7

What is the probability of drawing a green counter first?

• 7/9

• 2/9

• 1/2

• 5/9

What is the probability of drawing a blue counter after a green one?

• 5/8

• 3/8

• 7/8

• 2/8

What is the final probability of drawing one counter of each color?

• 14/72

• 28/72

• 7/36

• 1/2