Compute the Probability of an Event Using the Complement Rule $X$

question 229

Multiple Choice

Compute the Probability of an Event Using the Complement Rule
-A sample of 280 shoppers at a large suburban mall were asked two questions: (1) Did you see a television ad for the sale at department store X during the past 2 weeks? (2) Did you shop at department store X during the past 2 weeks? The responses to the questions are summarized in the table. What is the probability that a randomly selected shopper from the 280 questioned did not shop at department store $X$ ?
$\begin{array}{l|c|c} & \text { Shopped at X } & \text { Did Not Shop at X } \\\hline \text { Saw ad } & 140 & 30 \\\hline \text { Did not see ad } & 30 & 80\end{array}$

• A) \(0.393\)
• B) \(0.107\)
• C) \(0.286\)
• D) \(0.607\)

---

Definitions:

Interquartile Range

The difference between the upper and lower quartiles in a data set, measuring the spread of the middle half of the data points.

Semester Point

Typically refers to a system calculating academic performance, such as grade points accumulated in a semester.

Newspapers

Publications consisting of sheets of paper that are printed and distributed, usually on a daily or weekly basis, containing news, editorial articles, advertisements, and other items of general interest.

Store Manager

An individual responsible for overseeing the daily operations of a retail store, including sales, staff, stock, and resources management.