I finally understood your problem. The problem description needs some adjustment. It is not clear that it is requesting only the global variable named 'z'. I thought it was referring to every global variable.
Return a list sorted by number of occurrences
Maximum running product for a string of numbers
What digit is it?
How many monitors are connected ?
Anyone for tennis? Your chances of winning a tie-break game
Anyone for tennis? Your chances of winning a (standard) game
Code breaker, Part III: Operation Xiangliu
"Percentages may not total 100 due to rounding"
Rate of event occurence: find percentiles of the distribution (for smallish rates)
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