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I wrote it down in the attachment below. The efficiency e(in%) of an automobile engine is given by e=0.768s-0.00004s^3, where s is speed (in km/h)

I wrote it down in the attachment below. The efficiency e(in%) of an automobile engine is given by e=0.768s-0.00004s^3, where s is speed (in km/h) of the car. Find the average efficiency with respect to the speed for s=34 km/h to s=85 km/h. Round the answer to one decimal place

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