Basic Counting Techniques in Probability

Determine the probability of the following even occuring: You flip a fair coin and the coin will land heads up.

• 0

• 1/4

• 1/2

• 1

What is the probability of spinning the fair 8-sided spinner and landing on the 7?

• impossible - 0 / 8

• 1 / 2

• 1 / 8

• 7 / 8

What is the probability of spinning a fair 6-sided spinner and landing on an odd number?

• 1 / 2

• 5 / 6

• 6 / 6 or 1

• 0 / 6

What is the probability of rolling a fair 6-sided die and having it land on an odd number?

• 3/4

• 1/3

• 1/2

• 2/5

What is the probability of rolling a sum of 15 with a pair of six-sided dice?

• 0

• 1 / 36

• 15 / 36

• 5 / 36

What is the probability of spinning green or blue (assuming each slice/section is equal in size)?

• 0

• 5/12

• 1/2

• 3/4

Find the probability of NOT rolling a 2 on a single fair 6-sided die.

• 1/6

• 2/6

• 5/6

• 2

If you randomly pick from the following M & M colors from a bag, what is the probability that you choose blue?

• 8/26 or 4/13

• 7/26

• 8/25

• 1/3

Is this probability assignment possible?

• YES! Because all probabilities add up to 1!

• NO! Because it doesn't have enough probabilities.

• NO! Because the probabilities do not add up to 1.

• NO! Because I cannot get a grade of 0, 1, 2, 3, or 4.

What is the probability of spinning red?

• 0

• 5/12

• 1/2

• 3/4