FIRST ASSIGNMENT: MATH 10: WORKPLACE
8. A bag contains 5 red, 4 blue, 3 green and 2 black balls, and a single ball is selected. What is the probability
of selecting:
a. blue ball
1 mark
b. not a red or blue ball
1 mark
c. black or blue
1 mark
9. The Stair Game
The game starts on the fifth step of a staircase. Each player's turn consists of flipping two coins and moving up
or down according to the following rules:
If no heads appear on the player's two coins, the player does not move. If one head appears, the player moves
up one stair. If two heads appear, the player moves down one stair.
Calculate the following theoretic probabilities. (You may want to construct a tree diagram.)
a. Find P (no move) =
1 mark
b. Find P (up one) =
1 mark
c. Find P (down one) =
1 mark
10. What is the difference between experimental and theoretical probability?