### Question:
Beta extends AbstractObservable implements Distribution { public double getQuantile(double p) { return d_dist.inverseCumulativeProbability(p); } Beta(double alpha, double beta); AxisType getAxisType(); double getAlpha(); double getBeta(); double getQuantile(double p); @Override boolean equals(Object o); @Override double getCumulativeProbability(double x);  }### Answer:
@Test public void testGetQuantile() { assertEquals(0.025, new Beta(1, 1).getQuantile(0.025), EPSILON); assertEquals(0.5, new Beta(1, 1).getQuantile(0.5), EPSILON); assertEquals(0.95, new Beta(1, 1).getQuantile(0.95), EPSILON); assertEquals(0.07820626, new Beta(5, 18).getQuantile(0.025), EPSILON); assertEquals(0.12150867, new Beta(5, 18).getQuantile(0.12), EPSILON); assertEquals(0.20910650, new Beta(5, 18).getQuantile(0.5), EPSILON); assertEquals(0.35124865, new Beta(5, 18).getQuantile(0.93), EPSILON); }