The following contingency table shows the number of customers who bought various brands of digital cameras at Amazon.com and Ritz Camera. Given that the camera was purchased at Ritz Camera, the probability that it was a Sony brand is ________.
A) 0.105
B) 0.122
C) 0.178
D) 0.190

Question

The following contingency table shows the number of customers who bought various brands of digital cameras at Amazon.com and Ritz Camera.  Given that the camera was purchased at Ritz Camera, the probability that it was a Sony brand is ________.
A) 0.105 
B) 0.122 
C) 0.178 
D) 0.190

Quizplus · Accepted Answer

To find the probability that a customer bought a Sony camera at Ritz Camera, we need to look at the "Ritz Camera" column and find the number of Sony cameras sold, which is 34. Then we divide that by the total number of cameras sold at Ritz Camera, which is 278. Therefore, the probability is 34/278 or approximately 0.122. The correct answer is B.

The Following Contingency Table Shows the Number of Customers Who