Same issue here as in your third problem. Please check the absolute value of the differences of the computed values with the correct ones. Otherwise, more silly answers (again, like this one :-) will slip through!
Thanks for the catch. I've updated the test suite to check against upper and lower bounds of each answer.
Bottles of beer
Is the Point in a Circle?
Make a simplified barcode
Calculate the Number of Sign Changes in a Row Vector (No Element Is Zero)
Cycling — Normalized Power
Evened up (or not)
Calculator spelling - Letters to Numbers
Rule of mixtures (composites) - upper bound
Pattern Recognition 3 - Variable Unit and Array Length (including cell arrays)
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