a single coin is tossed 300 times heads was observed 180 times
The probability of getting heads on a single coin toss is 1/2, or 0.5.
Therefore, the expected number of heads in 300 coin tosses would be 300 * 0.5 = 150.
Since heads was observed 180 times, this is higher than the expected number, but it could still happen due to random chance.