Probability

Advanced Math 7 · Unit 16 · probability-trees

probability-trees

Name ______________________________Date ______________

1.
A bag holds $3$ red, $2$ blue, and $5$ green marbles. One marble is drawn at random. What is the probability that it is not green? Give a fraction in lowest terms.
Answer: ______________
2.
A bag holds $4$ red and $2$ blue counters. Two counters are drawn one after the other without replacement. What is the probability that both are the same colour? Give a fraction in lowest terms.
Answer: ______________
3.
Two fair six-sided dice are rolled. What is the probability that the two numbers add to $8$ ? Give a fraction in lowest terms.
Answer: ______________
4.
Two fair coins are tossed, one after the other. What is the probability of getting heads on the first coin and tails on the second?
1. (A)
  $\dfrac{1}{4}$
2. (B)
  $\dfrac{1}{2}$
3. (C)
  $\dfrac{3}{4}$
4. (D)
  $1$
5.
A bag holds $2$ red and $3$ blue marbles. Two marbles are drawn at random without replacement. What is the probability that at least one of them is red?
1. (A)
  $\dfrac{3}{10}$
2. (B)
  $\dfrac{2}{5}$
3. (C)
  $\dfrac{3}{5}$
4. (D)
  $\dfrac{7}{10}$
5. (E)
  $\dfrac{4}{5}$