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The graph represents 20 wind farms. For each wind farm, two points share the same horizontal coordinate and therefore represent the same wind farm. The red circle shows the relationship between the wind farm’s total rated generating capacity and its number of turbines. The black square shows the relationship between its total rated generating capacity and its mean rated capacity per turbine.

Based on the information provided, select from each drop-down menu the option that completes the statement most accurately.
Among the wind farms with total rated generating capacity between 280 MW and 360 MW, inclusive, the wind farm with the smallest mean rated capacity per turbine had turbines.

For of the 20 wind farms, the number of turbines was at least 60 and the mean rated capacity per turbine was at least 5.5 MW.

Official Solution:

Before considering the two statements, note how the graph should be read. For each wind farm, the red circle and black square at the same horizontal position represent the same wind farm. The red circle gives its number of turbines, while the black square gives its mean rated capacity per turbine.

Drop-down 1:

First, consider only the wind farms with total rated capacity between 280 MW and 350 MW.

Within that range, the lowest black square represents a mean rated capacity per turbine of about 5.6 MW. Looking at the red circle aligned vertically with that square, the same wind farm has 60 turbines.

Therefore, the correct selection is 60.

Drop-down 2:

We need wind farms that satisfy both conditions: at least 60 turbines and a mean rated capacity per turbine of at least 5.5 MW.

First, identify the red circles at or above the 60-turbine level. For each of those wind farms, check the black square at the same horizontal position.

Exactly three of those corresponding black squares are at or above the 5.5-MW level.

Therefore, exactly 3 wind farms satisfy both conditions.

Correct answer:

Drop-down 1: "60"
Drop-down 2: "3"
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