A study of 206 advertising firms revealed their income after taxes: Income After Taxes Number of Firms
Under $1 million 107
$1 million to $20 million 55
$20 million or more 44
a. What is the probability an advertising firm selected at random has under $1 million in income after taxes? (Round your answer to 2 decimal places.)
b-1. 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? (Round your answer to 2 decimal places.)
b-2.What rule of probability was applied?
A. Rule of complements only
B. Special rule of addition only