c. In a sample of 993 recent car buyers, the participants are asked to identify the most useful source of information about the cars they purchase. The responses and their frequencies are listed in the table.
Source | frequency |
consumer guide | 78 |
dealership | 279 |
word of mouth | 120 |
internet | 516 |
Based on this sample data, what percentage of car buyers have found either a dealership or the internet as the most useful source of information about the cars they purchase?