Reading Data and Graphs: Practice

Find the Tuesday bar and read its top off the scale.

$\text{Tuesday} = 10$

Its top reaches the highest gridline, $10$.

Look only at the Bears bars (the accent color): $2$, $6$, and $4$.

$\text{Bears: } 2,\; 6,\; 4 \;\Rightarrow\; \text{most in Game 2}$

The tallest Bears bar is in Game 2.

Multiply the slice's percent by the total number of students.

$\frac{25}{100} \times 80 = 20$

Since $25\%$ is one quarter, walking is a quarter of $80$, which is $20$.

When the axis starts above $0$, a bar's length no longer matches its value, so small gaps look large.

$\text{cut-off axis} \;\Rightarrow\; \text{lengths not proportional}$

Read the actual numbers off the scale rather than comparing heights.

Population over the years is a quantity changing across an ordered time axis.

$\text{change over time} \;\Rightarrow\; \text{line graph}$

The rising and falling line shows the trend at a glance.

A decrease is a segment sloping downward. The only one runs from Week 3 to Week 4.

$40 \to 30 \text{ (a drop of } 10 \text{ cm)}$

Every other segment rises.

Wednesday is $4$ circles, so $4 \times 4 = 16$ cars. Tuesday is $2.5$ circles, so $2.5 \times 4 = 10$ cars.

$16 - 10 = 6$

Convert each row with the key before subtracting.

All slices add to $100\%$, so the third is what is left after the other two.

$100\% - 30\% - 45\% = 25\%$

The parts must rebuild the whole.

The frequencies add to the total, so subtract the cat count from the total.

$30 - 12 = 18$

Everyone not in one category is in the other.

The fewest is the shortest bar.

$\text{Thursday} = 4 \text{ (shortest)}$

No other bar is lower than Thursday's.

The row is $4.5$ symbols, and each is worth $6$ days.

$4.5 \times 6 = 27$

The half sun adds $3$ days, half of the key's $6$.

Food is $35\%$ of the $2000$ dollar total.

$\frac{35}{100} \times 2000 = 700$

So $700$ dollars goes to food.