In a sample of 500 families, 90 have a yearly income of less than $40,000, 180 h

Question

In a sample of 500 families, 90 have a yearly income of less than $40,000, 180 have a yearly income of $40,000 to $80,000, and the remaining families have a yearly income of more than $80,000.

Write the frequency distribution table for this problem. Calculate the relative frequencies for all classes.

Income / [Frequency]/ [Relative Frequency]
Less than $40,000 [frequency goes here ] [relative frequency goes here ]
$40,000to $80,000 [ ] [ ]
More than $80,000 [ ] [ ]

a. Suppose one family is randomly selected from these 500 families. Find the probability that this family has a yearly income of less than $40,000.

P(income is less than $40,000)= [ ]

b. Suppose one family is randomly selected from these 500 families. Find the probability that this family has a yearly income of more than $80,000.

P(income is more than $80,000)= [ ]

Explanation / Answer

relative frequency = frequency/total

a)

P(income is less than $ 40,000)= 0.18

b)

P(income is more than $ 80,000)= 0.46

Please rate

frequency relative frequency less than 40000 90 0.18 40000 -80000 180 0.36 more than 80000 230 0.46

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