SAT Mean, Median, and Mode

What is the average (arithmetic mean) of \(3^{15}, 3^{20},\) and \(3^{25}?\)

(A) \(\ \ 20\)
(B) \(\ \ 60\)
(C) \(\ \ 3^{20}\)
(D) \(\ \ 3^{14} + 3^{19} + 3^{24}\)
(E) \(\ \ 3^{16} + 3^{21} + 3^{26}\)

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