Note: When the distribution follows a lognormal curve (values expressed in decibels), the mean and standard deviation can be used to compute the mediumpower talker. The talker volume distribution follows a lognormal curve and the mediumpower talker is uniquely determined by the average talker volume. The mediumpower talker volume, V , is given by V = V _{o} + 0.115σ^{2}, where V _{o} is the average of the talker volume distribution in volume units (vu), and σ^{2} is the variance of the distribution.
Source: from Federal Standard 1037C and from MILSTD188
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