The data below indicate the contamination in parts per million in each of 10 samples of drinking water at a specific location. 7.3, 7.4, 7.8, 9.3, 10.7, 12.1, 12.7, 12.8, 15.1, 23.4
What is the contamination level in parts per million (ppm) for the fourth sample of drinking water?

A) 7.3 ppm
B) 9.3 ppm
C) 12.1 ppm
D) 15.1 ppm