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? (20 marks)
Construct a table of frequencies for the blood groups (5 marks)
If a person from this group is selected at random, the probability that this person has O blood type is "P)O)=\\frac{15}{200}=0.075."
Table of frequencies:
"P(A)=\\frac{50}{200}=0.25."
"P(B)=\\frac{65}{200}=0.325."
"P(0)=\\frac{70}{200}=0.35."
"P(AB)=\\frac{15}{200}=0.075."
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