Compute Variance from a Python List

Write a function that accepts a Python list of numeric values and returns its population variance. Do not import third-party numerical packages such as numpy or pandas; rely only on built-in Python operations. Make the necessary choices explicit. Use population variance with denominator $$N$$, where $$N$$ is the list length, rather than sample variance. If the input list is empty, return None; if it contains exactly one element, return 0.0. Round every numeric result to 6…