NumberLinePlot and Labeling a specific point

Questions
1

Hello. I am a novice user of mathematica.
I am trying to display my research data on NumberLinePlot, and then would like to label the Mean of the data on the plot. I am uuable to figure this out.

For example, I would like to label the 6 with an arrow and call it “mean”

x = Range[11]

Mean[x]

NumberLinePlot[x]
2

Here is a way:

x = Range[11];
NumberLinePlot[x, 
 Epilog -> {Arrow[{{Mean[x], 0}, {Mean[x], 1}}], 
   Text["mean", {Mean[x], 2}]}, PlotRange -> {All, {0, 2}}]
3

Thank you! This is very helpful.

Do you know also how to space goups of data on NumberLinePlot?
I have 3 paired lists of data: {a,b}, {c,d}, {e,f}. I would like to show the dataset {a,b} as a narrowly spaced data on NumberLinePlot, and then a wide separation for showing {c,d}, and then wide separation for showing {e,f}. I have been playing around with Spacings on Mathematica, but not able to get it right.

Example:

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4

You can also check the documentation for NumberLinePlot, it is not very difficult:

NumberLinePlot[{Range[20], 2 Range[10], 3 Range[6],
  5 Range[4], 7 Range[2]},
 Spacings -> {.5, .1, .5, .1}]
5

Thanks everybody. This is working great. Appreciate all the help.