@Test
void test_dhyper() {

  int x = 14; // # number of white balls drawn from urn
  int m = 70; // # white balls in urn
  int n = 30; // # number of other balls
  int k = 20; // # number of balls drawn from urn
  int N = m+n; // # total number of balls in urn
  double result = hypergeometric.dhyper(x, N, m, k);
  assertEquals(0.2140911, result, EPSILON);
}