given an array, find it's standard deviation without using the std() function. Use sample formula (n-1) for standard deviation and round it to the nearest integer.
If array is empty, return -1.
note: std() function also uses the sample formula (n-1) for standard deviation.
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Is anyone else failing the first test? The test is catching "std" in the function's name.
The test suite was updated so that "std" is no longer in the name of the template function.
Otherwise, if you are attempting to use the std() function, you'll have to find a way around that—the standard-deviation formula should be easy to find.