Final answer:
The question seems related to finding local extrema, but there is not enough context to provide a meaningful answer. A function or graph is required to identify points of local maximum or minimum.
Step-by-step explanation:
The question seems to pertain to determining the coordinates of local extrema, which are the points in a function where the slope changes direction, indicating a local maximum or minimum. However, the provided data does not appear to represent a function or a set of points from which one can deduce local extrema with standard mathematical techniques. Typically, to find local extrema, one would analyze a given function, either by taking its derivative and solving for points where the derivative equals zero (critical points) or by analyzing a chart or graph to identify the high and low points visually.
Without a clear function, graph, or appropriate context, it's impossible to provide an accurate response to finding local extrema. If the data given in the question was intended to represent a particular function or graph, please provide that information for proper assistance.