Data analysis toolpak diappeared and won't reload?

[apumilia]

I was doing stats homework. I used data analysis tools for random #
generation on one problem. Then on the next problem it (data analysis) was
gone and it won't reload or reappear.

 

[Bernard Liengme]

Try Tools|Addins and check that AnalysisToolPac (the top item) is checked

best wishes