Suppose a diving board with no one on it bounces up and down in a simple harmonic motion with a frequency of $3\mathrm{.}5$Hz$3\mathrm{.}5$Hz$.$ The board has an effective mass of $9\mathrm{.}5$kg$9\mathrm{.}5$kg$.$

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What is the frequency, in hertz, of the simple harmonic motion of a $74\mathrm{.}5$kg$74\mathrm{.}5$kg diver on the board?