In functional analysis, this noun denotes linear functionals that act on compactly-supported test functions, which define a namesake generalized derivative. Methods that are “[this noun]-free” are also called “nonparametric” and include the Kolmogorov–Smirnov test. A letter that stands for this noun appears above the arrow in the central limit theorem, which concerns “convergence in [this word].” (-5[1])This noun appears in the name of a class of increasing, right-continuous functions that converge to zero and one at minus and plus infinity. Those functions, (-5[1])which are found by integrating probability density functions, are written capital F and preface this noun with “cumulative.” For 10 points, give this word for the spread of probabilities taken (10[1])by a random variable, (-5[1])such as the Poisson or binomial. ■END■ (10[1])