Lumen OHM

Based on the graph above, estimate to one decimal place the average rate of change from $\displaystyle {x}={1}$ to $\displaystyle {x}={5}$

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Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity