Method getQuantity

src/App/Expression.cpp:1908–1913

    }

    Quantity getQuantity() const override {
        if (n < 2)
            throw ExpressionError("Invalid number of entries: at least two required.");
        else
            return Quantity((M2 / (n - 1.0)).pow(Quantity(0.5)).getValue(), mean.getUnit());
    }

private:
    unsigned int n{0};