A study of 200 advertising firms revealed their income after taxes: Income after Taxes Number of Firms Under $1 million 102 $1 million to $20 million...

A study of 200 advertising firms revealed their income after taxes: 

Income after TaxesNumber of Firms

Under $1 million102

$1 million to $20 million 61

$20 million or more 37

a.What is the probability an advertising firm selected at random has under $1 million in income after taxes?

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b.What is the probability an advertising firm selected at random has either an income between $1 million and $20 million, or an income of $20 million or more? What rule of probability was applied?

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