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7-8.

A group of classmates surveyed how other students travel to school. The results of the survey are shown in the table below. Make a circle graph showing the results of the survey using percents. Homework Help ✎

$\left. \begin{array} { | c | c | } \hline \text {Mode of Transportation} & \text{Number of Students} \\ \hline \text { Bus } & { 90 } \\ \hline \text { Ride Bike } & { 30 } \\ \hline \text { Ride in Car } & { 75 } \\ \hline \text { Walk } & { 45 } \\ \hline \end{array} \right.$

Find the students using each mode of transportation as a percentage of all the students.

Each category of data is then represented by a portion of the circle. The measure of the angle of each sector portion is directly proportional to the corresponding percentage.

Consider the bike riders.

$\frac{30}{240}=0.125$ of the student population ride bikes to school.

Proportionately as an angle, this would be $12.5\%$ of$360°$ (a whole circle). This equates to $0.125(360°)=45°$. 