two coins are tossed simultaneously 500 times with the following frequencies of different outcomes:
Outcomes  2 heads  1 head  No head
Frequency  150  
  210        140
if two coins are tossed again, then find the probability of getting :
a) one head and one tail.
b) two tails.
 

Total number of tosses of 2 coins = 500Total number of possible outcomes = 5001.Number of times 1 head and 1 tail ocurrs = 210Number of favourable outcomes = 210Required probability = Number of favourable outcomesTotal number of possible outcomes = 210500 = 21502.Number of times 2 tail ocurrs = 140Number of favourable outcomes = 140Required probability = Number of favourable outcomesTotal number of possible outcomes = 140500 = 725

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