Basics of Probability

How many outcomes are in the sample space for tossing one coin?

• 1

• 2

• 4

• 8

Which of the following are possible samples spaces for tossing 2 coins? (May be more than one correct answer)

• {H, T, H, T}

• {HH, HT, TH, TT}

• {H, T}

• {T, H}

• {TT, HH, TH, HT}

Which one is the sample space for flipping 3 coins?

• {H, T}

• {H1, H2, H3, T1, T2, T3}

• {HHH, TTT, HTH, THT, TTH, HHT}

• {HHH, TTT, HTH, THT, TTH, HHT, HTT, THH}

Slips of paper marked with the numbers 1, 2, 3, 4, and 5 are placed in a box. After mixing, two slips are drawn. How many possible outcomes are there?

• 5

• 10

• 15

• 25

An unprepared student takes a 3-question true/false quiz in which he guesses the answers to all 3 questions. What is the probability he gets all 3 correct?

• 1/2

• 1/3

• 1/6

• 1/8

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(rolling a 4).

• 1/4

• 2/3

• 1/6

• 1/2

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