in an experiment a coin is tossed 500 times. if the head turns up 280 times, find the probability of getting a) a head, b) a tail    

Given-: A coin is tossed 500 times.                        1) Occurrence ​of head is 280                        2) Occurrence of tails is 500-280= 220
Probability-:   a) of getting a head:  280/500 = 28/50 = 14/25 = 0.56                        b) of getting a tail  :  220/500 = 22/50 = 11/25 = 0.44