72 divided by 6374 is equal to 0.0113
Hope it helps :)
The nominal rate to plug in will be 0.085.
Given to us, the nominal rate is 8.5%,
The value to plug into your equation,
The equation can be simple interest or compound interest in both cases the value of the nominal rate to the plugin will be the same.
Thus, the nominal rate is 8.5% can be written as

Hence, the nominal rate to plug in will be 0.085.
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The answer would be A. He should use the mean because it is in the center of the data. I hope this helped ^^