Probability and Data — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. Four full tally bundles plus 3 single marks equals 23.
Each bundle is five, so four bundles equal twenty plus three more equals twenty-three.
2. A bag has 2 red and 2 blue marbles. The chance of red is 2 out of 4.
Probability compares matching outcomes to total outcomes in the set.
3. If 1 of 4 cards shows a star, the probability of a star is 1/4.
Fractions for probability use total outcomes as the denominator below the line.
4. On a bar graph, apples reach 9 and pears reach 5. Apples beat pears by 4.
Comparing bars uses subtraction to find how much one exceeds the other.
5. A spinner has 2 red and 2 green sections. Red and green are equally likely.
When outcomes match in count, their likelihood is equal across the spinner.
6. Half of the spinner is blue, so blue lands 1 out of 2 times on average.
Half corresponds to a one-in-two chance over many spins of a spinner.
7. If a tally chart shows 12 dogs and 8 cats, the total pets equal 20.
Combine each category in a tally chart by adding the totals together.
8. If 1 of 8 socks is striped, the probability of striped is 1/8.
Total outcomes form the denominator of any simple probability fraction.
9. Drawing a black card from a deck of red cards only is impossible.
When zero matching outcomes exist, the event cannot happen, so it is impossible.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Sun rising tomorrow
→ Certain
Certain
Rolling a 7 on a standard die
→ Impossible
Impossible
Flipping heads on a fair coin
→ Likely or 1/2 chance
Likely or 1/2 chance
Snow in the desert this week
→ Unlikely
Unlikely
Each scenario has matching outcomes that fit one likelihood word best.