SOLUTION: In a sample of 500 families, 70 have a yearly income of less than $40,000, 220 have a yearly income of $40,000 to $80,000, and the remaining families have a yearly income of more t

Algebra ->  Probability-and-statistics -> SOLUTION: In a sample of 500 families, 70 have a yearly income of less than $40,000, 220 have a yearly income of $40,000 to $80,000, and the remaining families have a yearly income of more t      Log On


   

Question 1129714: In a sample of 500 families, 70 have a yearly income of less than $40,000, 220 have a yearly income of $40,000 to $80,000, and the remaining families have a yearly income of more than $80,000.
a. Write the frequency distribution table for this problem.
b. Calculate the relative frequencies for all classes.
c. Suppose one family is randomly selected from these 500 families.
d. Find the probability that this family has a yearly income of
1. less than $40,000
2. more than $80,000.
Answer by Boreal(15235) About Me  (Show Source):
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Three classes: under $40,000, between $40T and $80T, and >$80T
70 in the first, 220 in the second 210 in the third.
(14%, 44%, 42%)
less than $40T probability 0.14; greater than $80T probability 0.42