Question 133481: 4. Consider the following contingency table:
Under 20 21-30 31-40
Male 12 12 17
Female 13 16 21
a. If one person is selected at random, what is the probability that person is Female? ______
b. If one person is selected at random, what is the probability that person is either under 20 or over 30? _______
c. If one person is selected at random, what is the probability that person is either male or in the age group 21-30? _____
d. If two people are selected at random, what is the probability they are both female? ______
Answer by oscargut(2103)   (Show Source):
You can put this solution on YOUR website! Total are 91 persons, 41 Male and 50 Female
Under 20 are 25 persons, over 30 are 38 persons
Male or in he group 21-30 are 41+16=57
a. If one person is selected at random, what is the probability that person is Female? _50/91_____
b. If one person is selected at random, what is the probability that person is either under 20 or over 30? ___63/91____
c. If one person is selected at random, what is the probability that person is either male or in the age group 21-30? _57/91____
d. If two people are selected at random, what is the probability they are both female? ___(50/91)(50/91)=2500/8281___
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