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The relative frequency of Tails can be calculated by subtracting the number of times Heads occurred from the total number of tosses (300) and then dividing by the total number of tosses.
Number of Tails = Total tosses - Number of Heads
Number of Tails = 300 - 180
Number of Tails = 120
Relative frequency of Tails = Number of Tails / Total tosses
Relative frequency of Tails = 120 / 300
Relative frequency of Tails = 0.4
Therefore, the long run relative frequency of Tails is 0.4 or 40%.