### Question:
LognormalFisherKurtosisFromVolatilityCalculator implements DoubleBinaryOperator { @Override public double applyAsDouble(double sigma, double t) { double y = Math.sqrt(Math.exp(sigma * sigma * t) - 1); double y2 = y * y; return y2 * (16 + y2 * (15 + y2 * (6 + y2))); }  @Override double applyAsDouble(double sigma, double t);  }### Answer:
@Test public void test() { assertThat(F.applyAsDouble(SIGMA, T)).isCloseTo(0.3719, offset(1e-4)); }