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Question

A gasoline distributor wonders whether an individual's income level influences the grade of gasoline purchased. The following is a contingency table from a random sample of 300 individuals.
Personal Type of Gasoline
Income Regular Premium Extra Premium
Less than $50,000 90 10 20
$50,000 or More 60 60 60

The estimate of the expected number of individuals with income less than $30,000 who purchase regular gasoline when income and type of gasoline are independent is _______.
a) 60
b) 90
c) 120
d )80
e) 100

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