Please answer this using the 4949.5 to 5050.5 to get the best estimate. I can do this question in other methods, but fail to understand that one10,000

Please answer this using the 4949.5 to 5050.5 to get the best estimate. I can do this question in other methods, but fail to understand that one10,000 coins are tosseda) what is the probability that between 4950 and 5050 of them fall headsb) Between 4850 and 5150c)Between 4995 and 5005