CK-12 Basic Probability and Statistics - A Short Course

http://www.ck12.org Chapter 3. Discrete Random Variables - Basic

4.

Possible Outcomes :

BB,BG,BR,GB,GG,GR,RB,RG,RR

P(at least one red) =

3

9

P(at least one red) =

1

3

5..

6.

P(at least one 5) =

11

36

7.P(two 5’s)= 361

8.

P(2 heads) =

4

20

=20%