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.
"global variable z" was explicitly mentioned in both the problem title and the problem description. Other than that, I trust that your comment and the Test Suite should be sufficient to remove any residual doubts.
Function composition - harder
Finite Continued Fraction
Volume difference between Ellipsoid and Sphere
Coin Tossing: Probability of Same Heads for N tosses
Flexible Anonymous Function
Back to basics: adding comments to your code
Seemingly impossible problem
Rate of event occurence: find percentiles of the distribution (for smallish rates)
Add all the numbers between two limits (inclusive)
Code breaker, Part III: Operation Xiangliu
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