As a Part of a Market Research Project, You Survey

As a part of a market research project, you survey six random people to see how much gas per week they would buy at various prices. The data you collect is in the accompanying table. Assuming that these are the only six consumers in the market, plot the market demand curve for gas.
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Quantity of Gallons of Gas Demanded Per Week
$$\begin{array} { | l | l | l | l | l | l | l | } \hline \text { Price per gallon of gasoline } & \text { Marty } & \text { Zain } & \text { Doc } & \text { Mikael } & \text { Zoya } & \text { Amirah } \\\hline \$ 1.50 & 10 & 15 & 6 & 20 & 20 & 6 \\\hline \$ 2.00 & 8 & 12 & 3 & 18 & 19 & 5 \\\hline \$ 2.50 & 6 & 9 & 1 & 14 & 17 & 4 \\\hline \$ 3.00 & 4 & 6 & 0 & 10 & 15 & 3 \\\hline \$ 3.50 & 2 & 3 & 0 & 4 & 12 & 1 \\\hline\end{array}$$