If, in a frequency distribution, the initial class interval is indeterminate at its beginning and/or the final class interval is indeterminate at its end, the distribution is said to possess "open ended" classes.
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Yes, if it is a mathematically well behaved distribution.For a symmetric distribution, such as the Gaussian (Normal) it is the same as the mean.For the Standard Normal or the Student's t the median is 0.For the exponential distribution, with parameter lambda, the median is ln(2)/lambda. (ln = natural logarithm.]A chi-squared distribution with k degrees of freedom has a median approximated by k*(1 - 2/9k)^3.For a Beta(a, b) distribution the median depends on the incomplete Beta function but if a and b >1, then it can be approximated by (a - 1/3)/(a + b - 2/3).For a Weibull distribution, with scale parameter L and shape parameter K, it is L*(ln2)^(1/K).
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I'm not sure what the question means but here we go with an answer. Open ended questions are one that when asked can not be answer with a simple yes or no. The answerer must elaborate, explain and otherwise embellish in order to give an answer. To ask an open ended question you don't as "why" but rather "what" and "how". Until you get used to asking such questions a good idea to write them down down ahead of time until the become second nature to you. There are statistical programs that can categorize open-ends. You could then create a chart based on the number of comments in each category.