What is the probability that a 100-year flood will occur at least once in 100 years?
A)1 percent
B)10 percent
C)50 percent
D)63 percent
E)0 percent

Question

Quizplus · Accepted Answer

The probability of a 100-year flood occurring in any given year is 1/100 or 0.01. The probability of a 100-year flood NOT occurring in any given year is 1 - 0.01 = 0.99. The probability of a 100-year flood NOT occurring in 100 years is (0.99)^100 = 0.366. Therefore, the probability of at least one 100-year flood occurring in 100 years is 1 - 0.366 = 0.634 or approximately 63%.

What Is the Probability That a 100-Year Flood Will Occur