A single coin is tossed 300 times. Heads were observed 180 times. What is the long run relative frequency of tails? Express the answer in decimal form.

To find the long run relative frequency of tails, we first calculate the number of times tails occurred during the 300 coin tosses:

Number of tails = 300 - 180 = 120

Next, we find the relative frequency of tails by dividing the number of tails by the total number of tosses:

Relative frequency of tails = 120 / 300 = 0.4

Therefore, the long run relative frequency of tails is 0.4.