The department of natural resources reports that a fish is unsafe to eat if the polychlorinated biphenol (PCB) concentratio exceeds 5 parts per billion (ppb). A sample of 10 fish taken from a local lake results in the data listed below. Test the claim that the fish fin this local lake have a PCB that is unsafe.
2.9, 7.6, 4.8, 5.2, 5.1, 4.7, 6.9, 4.9, 3.7, 3.8