Data Interpretation — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. A pie chart shows pets: 50% dogs, 30% cats, 20% fish out of 60 pets. How many cats?
A) 18 cats
B) 20 cats
C) 15 cats
D) 12 cats
Thirty percent of sixty equals 0.30 times 60, which gives eighteen cats in the survey.
2. Sales rose from 100 in week 1 to 160 in week 4. Average weekly increase?
A) 15
B) 20
C) 25
D) 30
Total rise is sixty across three weekly intervals, so the average weekly increase equals twenty units.
3. A double bar graph: math 80, reading 65 for class A; math 70, reading 75 for class B. Which class scored higher overall?
A) Class B by 5
B) Same total
C) Class A by 5
D) Class A by 10
Class A totals one hundred forty five and class B totals one hundred forty five, but A is higher in math by five.
4. A line graph drops from 90 to 60 in five days. What is the average daily decrease?
A) 5
B) 4
C) 8
D) 6
Total drop is thirty across five days, so the average daily decrease equals six units per day.
Part B: Fill in the Blank
Write the correct answer on each line.
1. A pie chart slice labeled 75% covers three fourths of the whole circle.
Seventy five percent equals three fourths, so this slice covers three of the four quarters of the circle.
2. If 40% of 150 students walk, then 60 students walk to school.
Forty percent of one hundred fifty equals 0.40 times 150, which gives sixty students walking to school.
3. A trend that doubles each step from 3 gives the values 3, 6, 12, 24.
Doubling the previous value of twelve gives twenty four as the next number in this growing pattern.
4. If percents on a pie chart are 35, 25, and 40, the third must be 40.
Thirty five plus twenty five equals sixty, so the missing slice must be forty to total one hundred percent.
5. If a line graph shows rainfall rising by 2 mm each day from 5 mm, day 4 shows 11 mm.
Starting at five and adding two for three more days gives eleven millimeters of rainfall on day four.