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Intro to Probability
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Intro to Probability
📚 Part 1: Multiple Choice
1. Toss two fair coins. Which is the complete sample space?
{HH, HT, TH, TT}
{H, T}
{HH, TT}
{HHTT}
2. Roll one fair six-sided die. What is P(rolling an even number)?
1/6
1/2
2/3
1/3
3. Which statement describes an impossible event?
Rolling a 7 on one six-sided die
Getting at least one head with two coins
The sun rising tomorrow
A fair coin landing heads
4. Check all that apply about probability values:
0 means impossible
1 means certain
Probability can be greater than 1
🔗 Part 2: Match Vocabulary
5. Draw a line to match each probability term (A–D) with the best definition (1–4).
A. Sample space
B. Event
C. Certain
D. Unlikely
1. A single outcome or a set of outcomes from an experiment
2. All possible outcomes of an experiment
3. Happens every time (probability = 1)
4. Not likely to happen but still possible
✏️ Part 3: Short Answers & Calculations
6. List the sample space for tossing two coins (write all outcomes):
7. A fair six-sided die is rolled once. What is P(rolling a 3)? Write as a fraction and as a decimal.
8. Two coins are tossed. Define the event "at least one tail." List the outcomes for this event, classify it as likely, unlikely, certain, or impossible, and give its probability as a fraction.
9. In one sentence, explain what a sample space is:
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