A sample of 220 shoppers at a large suburban mall were asked two questions: (1) Did you see a television adfor the sale at department store X during the past 2 weeks? (2) Did you shop at department store X during thepast 2 weeks? The responses to the questions are summarized in the table. What is the probability that arandomly selected shopper from the 220 questioned did not shop at department store X? Round the the nearestthousandth. $$\begin{array} { l | c | c }
& \text { Shopped at X } & \text { Did Not Shop at X } \
\hline \text { Saw ad } & 100 & 35 \
\hline \text { Did not see ad } & 35 & 50
\end{array}$$
A) 0.386
B) 0.159
C) 0.227
D) 0.614

Question

A sample of 220 shoppers at a large suburban mall were asked two questions: (1) Did you see a television adfor the sale at department store X during the past 2 weeks? (2) Did you shop at department store X during thepast 2 weeks? The responses to the questions are summarized in the table. What is the probability that arandomly selected shopper from the 220 questioned did not shop at department store X? Round the the nearestthousandth. $$\begin{array} { l | c | c } 
& \text { Shopped at X } & \text { Did Not Shop at X } \
\hline \text { Saw ad } & 100 & 35 \
\hline \text { Did not see ad } & 35 & 50
\end{array}$$
A) 0.386
B) 0.159
C) 0.227
D) 0.614

Quizplus · Accepted Answer

The probability that a randomly selected shopper did not shop at department store X is calculated by dividing the total number of shoppers who did not shop at X by the total number of shoppers surveyed. From the table, 35 + 50 = 85 shoppers did not shop at X out of a total of 220 shoppers. Therefore, the probability is 85/220 = 0.386 (rounded to the nearest thousandth).

A Sample of 220 Shoppers at a Large Suburban Mall