12 multiple-choice questions, progressively harder.
A graph shows that ice cream sales and sunburns both rose during the summer. What can you correctly conclude?
Solution
Correct answer: B
A graph shows what was measured, not why. Both quantities rising together does not show that one causes the other.
both rose ≠ one causes the other\text{both rose} \;\ne\; \text{one causes the other}both rose=one causes the other
The only safe conclusion is the fact the graph shows: both rose in summer.
The bar graph shows pizzas sold each day. How many pizzas were sold on Wednesday?
Find the Wednesday bar and read its top off the scale.
Wednesday=10\text{Wednesday} = 10Wednesday=10
Its top reaches the highest gridline.
The double bar graph shows goals by the Lions and Bears. What were the combined goals of both teams in Game 2?
Correct answer: A
Read both Game 2 bars and add them. The Lions scored 444 and the Bears scored 666.
4+6=104 + 6 = 104+6=10
The bar graph shows pizzas sold each day. How many pizzas were sold in total over the four days?
Correct answer: C
Read all four bars and add: Monday 888, Tuesday 666, Wednesday 101010, Thursday 444.
8+6+10+4=288 + 6 + 10 + 4 = 288+6+10+4=28
A circle graph of 606060 people shows that 35%35\%35% chose tea. How many people is that?
Multiply the slice's percent by the total.
35100×60=0.35×60=21\frac{35}{100} \times 60 = 0.35 \times 60 = 2110035×60=0.35×60=21
So 212121 people chose tea.
The circle graph shows how a student split 404040 hours of screen time. How many hours went to Games?
Correct answer: D
Games is 50%50\%50% of the 404040 hours.
50100×40=20\frac{50}{100} \times 40 = 2010050×40=20
Half of 404040 hours is 202020 hours.
The line graph shows daily high temperatures. What was the net change from Monday to Friday?
Net change compares only the first and last points. Monday is 101010 and Friday is 404040.
40−10=3040 - 10 = 3040−10=30
The ups and downs in between do not matter for the net change.
A circle graph has three slices. Two are labeled 12%12\%12% and 38%38\%38%. What percent is the third slice?
The slices add to 100%100\%100%, so subtract the two known slices.
100%−12%−38%=50%100\% - 12\% - 38\% = 50\%100%−12%−38%=50%
A frequency table of 252525 pets shows 101010 dogs and 888 cats, with the rest being fish. How many fish are there?
The frequencies add to the total, so subtract the known counts from 252525.
25−10−8=725 - 10 - 8 = 725−10−8=7
Whatever is not a dog or cat must be a fish.
Which display is best for comparing the number of students in five different clubs?
The clubs are separate categories, and you want to compare their amounts.
compare separate categories ⇒ bar graph\text{compare separate categories} \;\Rightarrow\; \text{bar graph}compare separate categories⇒bar graph
A line graph would be wrong because clubs are not an ordered time sequence.
You are designing a pictograph with a key of "each symbol =10= 10=10 books." How many symbols are needed to show 353535 books?
Divide the value by the key to find how many symbols.
3510=3.5\frac{35}{10} = 3.51035=3.5
That is 333 whole symbols and one half symbol.
The bar graph shows pizzas sold each day. How many fewer pizzas were sold on Thursday than on Monday?
Read both bars: Monday is 888 and Thursday is 444.
8−4=48 - 4 = 48−4=4
Thursday's bar is 444 shorter than Monday's.
Reset this practice set?
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