Over a 200-year period, a volcano erupted once. According to this information, what is the yearly frequency of volcanic eruption? A. 99% B. 20% C. 0.5% D. 1%
C 0.5 percent is the answer this is because 1 is .5 percent of 200.
The answer cannot be A because this would mean there were 198 eruptions. It cannot be B because this would mean there were 40 eruptions. It cannot be D because this would mean there were 2 eruptions.
