If a stranger gives you a coin and you toss it 1,000,000 times and it lands on heads 600,000 times, what is p(heads) for that coin?

The human resources manager at a company records the length, in hours, of one shift at work, x. he creates the probability distribution below. what is the probability that a worker chosen at random works at least 8 hours? 0.62 0.78 0.84 0.96