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
"\\def\\arraystretch{1.5}\n \\begin{array}{c:c:c:c}\n & Type & Frequency & Relative\\ frequency \\\\ \\hline\n & A & 50 & 0.25 \\\\\n \\hdashline\n & B & 65 & 0.325 \\\\\n & O & 70 & 0.35 \\\\\n & AB & 15 & 0.075 \\\\\n Sum= & & 200 & 1 \\\\\n\\end{array}"
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