The blood groups of 200 people are 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?
Construct a table of frequencies for the blood groups
the probability that this person has O blood type:
"70\/200=7\/20"
table of frequencies:
blood type frequency
A 50
B 65
O 70
AB 15
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