I will give you one hint: Using 0.5 makes the first and last items half as likely as those in the middle of the array.
Ugg, OK, not nearly what I thought it was doing. Other values I tried such as 2-9 sometimes the box would come up, other times I got an "Out of range" error. Anything 10 and up wouldn't work at all. I'll ponder through this tonight and see if anything comes to me.
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