please! (:3) How to find mean for unknown set of data with given values for median, range and mode.

If the median is 2.5, what does that tell you about the middle two numbers?

What does the mode then tell you?

Think about it, and tell us what ideas you have. This is not a routine problem for which you use a formula or standard algorithm; you have to ponder what you know, and invent a way to solve it that works for these particular numbers.
 
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