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You need to know the domain in order to find the range.
There is no direct relationship between the range and the median. So knowing that your median is 20 does not automatically give you the range. The median is just the middle value. That does not tell you what the first and last values are, which is what you need to know to find the range. The median of 19, 20 and 21 is 20, and the range is 2. The median of 4, 20 and 79 is also 20, but the range is 75. The median of 8, 16, 17, 23, 50 and 320 is also 20, but the range is 312. So, as you can see, the Median in no way can tell you what the range will be. You need to know what all of the numbers are, or at least the lowest and highest to know the range.
You need to know its condition and mint mark. Check a site such as the one below for a range of values.
In general, you cannot. You need to know how many numbers there are and then, in only a select few cases can you find the set.
You know how sometimes there's a key word like difference means subtract? Well, spread means the range. If you don't know what the range is, the range is: maximum-mini=range (or spread) Hope I helped!