In a set of observations 13, 6, 31, 25, 20, 39, 15, 36If γ(13) = 7, γ(20) = 5 and γ(36) = 2. Then γ(25) is

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In a set of observations <br />13, 6, 31, 25, 20, 39, 15, 36<br />If γ(13) = 7, γ(20) = 5 and γ(36) = 2. Then γ(25) is