Probability and Statistics — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. The mean of 4, 6, 8, 10, 12 is 8.
The sum forty divided by five values equals eight as the average.
2. The median of 3, 5, 7, 9, 11 is 7.
With five ordered numbers, the third value is the median, here seven.
3. The mode of 2, 4, 4, 6, 8 is 4.
Four appears twice while every other number appears once, so it is the mode.
4. The range of 5, 9, 12, 15, 20 is 15.
The largest value twenty minus smallest value five equals a range of fifteen.
5. The mean of 10, 20, 30 is 20.
The sum sixty divided by three values equals an average of twenty.
6. The median of 2, 4, 6, 8 is 5.
With four values, the middle pair is four and six, averaging to five.
7. The mode of 7, 8, 8, 9, 10, 10, 10 is 10.
Ten appears three times, more than any other value, making it the mode.
8. The range of 14, 18, 22, 26 is 12.
Maximum twenty-six minus minimum fourteen equals a range of twelve.
9. The mean of 3, 5, 7 is 5.
The sum fifteen divided by three numbers gives an average of five.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Mean of 2, 4, 6
→ 4
4
Median of 1, 3, 5, 7, 9
→ 5
5
Mode of 4, 4, 6, 8
→ 6
6
Range of 10, 12, 17
→ 7
7
Each data set has exactly one matching value among the four results.