Probability of Drawing Discs

The video tutorial covers a probability question involving drawing a tree diagram. It begins with setting up the experiment, which involves a bag of 10 discs of different colors. The tutorial explains how to draw the tree diagram and calculate probabilities for the first and second picks of discs without replacement. It then solves specific probability questions using the tree diagram, such as finding the probability of both discs being green or one being red and the other blue.

What is the total number of discs in the bag?

• 10

• 8

• 12

• 15

How many blue discs are in the bag?

• 5

• 3

• 2

• 7

What is the probability of drawing a red disc on the first pick?

• 5/10

• 1/5

• 1/2

• 3/10

What is the probability of drawing a green disc on the first pick?

• 2/5

• 1/3

• 3/10

• 1/2

If a blue disc is picked first, what is the probability of picking another blue disc?

• 1/9

• 2/9

• 1/5

• 1/3

If a red disc is picked first, what is the probability of picking a green disc next?

• 5/9

• 2/9

• 3/9

• 1/3

What is the probability of picking a red disc first and then a blue disc?

• 1/6

• 1/5

• 1/3

• 1/9

What is the probability of picking a green disc first and then a red disc?

• 5/9

• 1/3

• 1/9

• 1/5

If a green disc is picked first, what is the probability of picking another green disc?

• 1/9

• 3/9

• 2/9

• 1/3

What is the probability of picking a blue disc first and then a red disc?

• 1/9

• 1/3

• 2/9

• 1/5