statistics.pstdev(data, mu=None) Return the population standard deviation (the square root of the population variance). See

multiply(x, y) Return the product of x and y.

scaleb(x, y) Returns the first operand after adding the second value its exp.

class decimal.DefaultContext This context is used by the Context constructor as a prototype for new contexts. Changing

math.tanh(x) Return the hyperbolic tangent of x.

max_mag(other, context=None) Similar to the max() method, but the comparison is done using the absolute values

is_nan(x) Returns True if x is a qNaN or sNaN; otherwise returns False.

statistics.median_high(data) Return the high median of data. If data is empty, StatisticsError is raised

math.e The mathematical constant e = 2.718281..., to available precision.

random.choice(seq) Return a random element from the non-empty sequence seq. If seq is empty, raises