Fifteen different sites were sampled for sailfin molly and classified as either absent or present. Using the following data, calculate the probability that sailfin molly will be present at:
Well since the data only says that there are 2 possible outcomes: which is absent or present
so testing each site: 1 site/2outcomes will be equal to .50
Therefore, the probability that sailfin molly will be present is .50 or 50%
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