An efficiency study conducted for a company showed that the number of devices assembled by the average worker t hr after starting work at 7 A.M. is given by 
At what time during the morning shift is the average worker performing at peak efficiency?
A) At 9 A. M. the average worker is performing at peak efficiency.
B) At 10 A. M. the average worker is performing at peak efficiency.
C) At 7 A. M. the average worker is performing at peak efficiency.
D) At 8 A. M. the average worker is performing at peak efficiency.
Correct Answer:
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