The probability that the next person will purchase no costume is 7/166 if the 7 visitors purchased no costume.
It is defined as the ratio of the number of favorable outcomes to the total number of outcomes, in other words the probability is the number that shows the happening of the event.
Total number of visitors = 7+143+16 = 166
Number of visitors purchased no costume = 7
The probability that the next person will purchase no costume:
= 7/166
Thus, the probability that the next person will purchase no costume is 7/166 if the 7 visitors purchased no costume.
Learn more about the probability here:
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