fact: Definition sample_variance (ls : list Ocaml.float) : Ocaml.float := let avg := mean ls in (Σ (List.map (fun x => (x - avg) * (x - avg)) ls) / (List.length ls - 1))%ocaml_float.
imports: Fiat.Common.Equality Fiat.Parsers.ParserFromParserADT Coq.ZArith.BinInt Fiat.Parsers.Refinement.Tactics Fiat.Common.BoolFacts Fiat.ADTNotation.BuildComputationalADT Fiat.Common.NatFacts Fiat.Parsers.StringLike.FirstCharSuchThat Coq.Strings.Ascii Coq.extraction.ExtrOcamlBasic Coq.extraction.ExtrOcamlNatInt Coq.extraction.ExtrOcamlZInt Coq.extraction.ExtrOcamlString Coq.extraction.ExtrOcamlIntConv Fiat.Parsers.ExtrOcamlPrimitives