Probability of Picking Discs

The video tutorial covers a probability question involving drawing a tree diagram. It begins with setting up the experiment, which involves a bag with 10 discs of different colors. The tutorial explains how to construct a tree diagram to represent the possible outcomes and their associated probabilities. It then delves into calculating probabilities for the second pick without replacement. Finally, the video addresses specific questions related to the probability of certain outcomes, such as both discs being green or one disc being red and the other blue.

What is the total number of discs in the bag?

• 15

• 8

• 12

• 10

How many blue discs are there in the bag?

• 3

• 2

• 7

• 5

What is the probability of picking a red disc on the first try?

• 1/5

• 1/3

• 1/2

• 3/10

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

• 1/9

• 1/3

• 1/5

• 1/10

What is the probability of picking a green disc on the second try if a red disc was picked first?

• 3/10

• 1/3

• 1/5

• 2/9

What is the probability of both discs being green?

• 1/10

• 1/25

• 1/20

• 1/15

What is the probability of picking a red disc followed by a blue disc?

• 1/9

• 1/5

• 1/3

• 1/6

What is the probability of picking a blue disc followed by a red disc?

• 1/15

• 1/9

• 1/6

• 1/5

What is the probability that the second disc is not red?

• 1/2

• 1/3

• 2/3

• 1/4

What is the probability of picking a green disc followed by a red disc?

• 1/9

• 1/5

• 1/3

• 1/6