Question

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Answer 1

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