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The long-run relative frequency of tails can be calculated by subtracting the relative frequency of heads from 1.
Relative frequency of heads = (number of heads) / (total number of tosses) = 180 / 300 = 0.6
Relative frequency of tails = 1 - 0.6 = 0.4
Therefore, the long-run relative frequency of tails is 0.4.