statistical range of a measurement

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DoI need to find out the range? How to solve this problem? hints or canonical answer will be helpful for me.

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Hint:

You know that $X_{max}-X_{min}=17$, where $X$ then denotes the length. Consider the extreme case when the given measurement is the maximum, i.e. $X_{max}=49.5$. What does this tell us about the minimum possible value of a measurement?