The best prediction of the height of the plant at 5 weeks is 6 inches, the correct option is C.
What is a Graph?
Graph is a mathematical representation of relation between two objects.
The graph shows the comparison of the plant height to the age of the plant, in weeks.
The x axis has number of weeks.
The y axis has height in inches.
The regression equation that represent the graph is
y = 1.3x - 0.8
A regression equation is used to find the relation between the data, if there exists.
The regression equation is of the form Y = a+bX, Y is the dependent variable and X is the independent variable.
The prediction of the height of the plant at 5 weeks has to be done.
On observing the graph and drawing a straight line at x = 5 on the graph,  the point at which it intersects is y ≈ 6 inches.
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