Mathematics
Grade 9
15 min
Probability of independent and dependent events
Probability of independent and dependent events
Tutorial Preview
1
A bag has 2 red and 3 blue marbles. You pick one, replace it, then pick another. What is P(Red, then Red)?
2
A bag has 2 red and 3 blue marbles. You pick one, DON'T replace it, then pick another. What is P(Red, then Red)?
3
Which pair of events is dependent: (A) Rolling a die twice, or (B) Picking two students from a class?
Sample Practice Questions
Easy
You flip a fair coin twice. What is the probability of getting two heads (H, H)?
0.1/4
1.1/2
2.1/3
3.1
Easy
A bag has 2 red and 1 blue sock. You pick two without replacement. What is P(Red, then Red)?
0.1/3
1.2/3
2.1/2
3.1/6
Easy
Which of these events are independent?
0.Rolling a die twice
1.Drawing 2 cards
2.Picking 2 friends
3.Eating 2 cookies
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