Determining Probability Basic

You give the answer to a probability problem as 6/5. The teacher marks it wrong. Why?

• It should have been 5/6.

• Its not written as a percent.

• Its more than 1.

• Its not written as a decimal.

Which of these cannot be considered a probability of an outcome?

• 1/3

• -1/5

• 0.80

• 112%

• 1

Roll a die one time. Find P(even number).

• 1/2

• 1/3

• 3/6

• 2/6

Roll a die one time. Find P(a number less than 7).

• 0

• 1

• 7/6

• 1/6

Roll a die one time. Find P(a number greater than 3 or odd).

• 0

• 1/2

• 5/6

• 1/6

Draw one card from a standard deck. Find P(ace)

• 1/13

• 1/4

• 4/13

• 1/52

Draw one card from a standard deck. Find P(diamond)

• 8%

• 25%

• 31%

• 2%

Draw one card from a standard deck. Find P(ace of diamonds)

• 1/13

• 1/4

• 4/13

• 1/52

Draw one card from a standard deck. Find P(4 or club)

• 17/52

• 2/13

• 4/13

• 1/26

Draw one card from a standard deck. Find P(black and a 10)

• 17/52

• 2/13

• 4/13

• 1/26