The lifespan of a coho salmon [Oncomynchus kisutoh} varies but is estimated to be a maximum of 5 years. At the end of their life the salmon, who typically are found in ocean waters, return to freshwater rivers and streams to spawn. Let X {measured in years] be the age of the salmon when it returns to the freshwater to spawn. The cumulative distribution function for this oontinuous random variable X is given by: l}, xd x): ix2+ix 0