Question

a coin is tossed 15times and observed that head comes 11times . find the probability that a tail comes up

Answer 1

no. of heads  = 11
no. of tails     = 15-11
                      =  4
  probability of tails = 4/15

Answer 2

no. of times which shows heads =11
No. of times coin tossed =15
no. of times which shoes tails =15-11=4
there fore probability of getting tails is 4/15