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f= female
m= male
Left : f+m=18.....................................(i)
Right: 5f + 9m=122..............................(ii)
(ii)-5(i)
5f+9m-5f-5m=122-90
4m=32
m=8, f=10 .............(from i)
Probability that a right handed student selected is female:
= 5f/total
= 50/(122+18)
= 5/14 = 0.357= (B) option
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