Concept explainers
To find: the
Answer to Problem 85E
Theprobability that she bought premium gas is
Explanation of Solution
Given:
88% of the automobiles filled their vehicles with regular gasoline, 2% purchase midgrade gas and 10% bought premium gas.
28% is paid with credit card on regular gas, 34% is paid on midgrade gas, and 42% on premium gas.
Concept used:
Definition condition probability:
Calculation:
According to the question, the tree diagram is:
From ex-83, it get
Definition condition probability:
Thus, it obtained:
Hence, the probability that she bought premium gas is
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