The blood groups of 200 people is distributed as follows: 50 have type a blood, 65 have b blood type,70 have o blood type and 15 have type ab blood. If a person from this group is selected at random, what is the probability that this person has o blood type?
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total outcomes=200
favourable outcomes=70
probability=f.o/t.o
=70/200
=7/20
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