Yes, depending on the function. For example, in the function y = x squared, for x-values of both 2 and -2 you get the same y-value.
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The middle value in a data set is the median. If there are an even number of values in the set, you average the middle two values to get the median.
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If you know the two values you shouldn't have to estimate. But you are looking for the mean, or average. Simply add them together and divide by two. Otherwise you are just estimating.
The median of a set of data is the "middle" value. Whenever there is an even number of values in a data set, you take the middle two numbers, add them together, and divide by two. For cases when the two middle numbers happen to be the same, you still add them up and divide by two. The key point is just that the answer will be the same as both the numbers.