diff --git a/apps/probability/test/distributions.cpp b/apps/probability/test/distributions.cpp
index 4cb4b5c84..20bd9d9f9 100644
--- a/apps/probability/test/distributions.cpp
+++ b/apps/probability/test/distributions.cpp
@@ -19,7 +19,13 @@ void assert_cumulative_distributive_function_direct_and_inverse_is(Probability::
   quiz_assert(!std::isnan(r));
   quiz_assert(!std::isinf(r));
   quiz_assert(std::fabs(r-x) < FLT_EPSILON || std::fabs(r-x)/x < FLT_EPSILON);
+}
 
+void assert_finite_integral_between_abscissas_is(Probability::Distribution * distribution, double a, double b, double result) {
+  double r = distribution->finiteIntegralBetweenAbscissas(a, b);
+  quiz_assert(!std::isnan(r));
+  quiz_assert(!std::isinf(r));
+  quiz_assert(std::fabs(r-result) < FLT_EPSILON || std::fabs(r-result)/result < FLT_EPSILON);
 }
 
 //TODO other distributions
@@ -37,6 +43,13 @@ QUIZ_CASE(binomial_distribution) {
   distribution.setParameterAtIndex(0.1, 1);
   assert_cumulative_distributive_function_direct_and_inverse_is(&distribution, 0.0, 0.166771816996665822596668249389040283858776092529296875);
   assert_cumulative_distributive_function_direct_and_inverse_is(&distribution, 1.0, 0.4817852491014791294077213024138472974300384521484375);
+
+  // B(21, 0.2)
+  distribution.setParameterAtIndex(21.0, 0);
+  distribution.setParameterAtIndex(0.2, 1);
+  assert_finite_integral_between_abscissas_is(&distribution, 4.0, 4.0, 0.21563235015849934848);
+  assert_finite_integral_between_abscissas_is(&distribution, 5.0, 4.0, 0.0);
+  assert_finite_integral_between_abscissas_is(&distribution, 4.0, 5.0, 0.398919847793223794688);
 }
 
 QUIZ_CASE(chi_squared_distribution) {
@@ -58,6 +71,12 @@ QUIZ_CASE(chi_squared_distribution) {
   assert_cumulative_distributive_function_direct_and_inverse_is(&distribution, 1.3, 0.047059684573231390369851823152202996425330638885498046875);
   assert_cumulative_distributive_function_direct_and_inverse_is(&distribution, 2.9874567, 0.250530060451470470983537097708904184401035308837890625);
   assert_cumulative_distributive_function_direct_and_inverse_is(&distribution, 4.987, 0.53051693435084168459781039928202517330646514892578125);
+
+  // Chi Squared distribution with 6 degrees of freedom
+  distribution.setParameterAtIndex(6.0, 0);
+  assert_finite_integral_between_abscissas_is(&distribution, 4.0, 4.0, 0.0);
+  assert_finite_integral_between_abscissas_is(&distribution, 5.0, 4.0, 0.0);
+  assert_finite_integral_between_abscissas_is(&distribution, 4.0, 5.0, 0.1328633002997339414718);
 }
 
 QUIZ_CASE(student_distribution) {
@@ -79,6 +98,12 @@ QUIZ_CASE(student_distribution) {
   assert_cumulative_distributive_function_direct_and_inverse_is(&distribution, -4.987, 0.00167496657737900025118837898929768925881944596767425537109375);
   assert_cumulative_distributive_function_direct_and_inverse_is(&distribution, 1.3, 0.876837383157582639370275501278229057788848876953125);
   assert_cumulative_distributive_function_direct_and_inverse_is(&distribution, 2.9874567, 0.98612148076325445433809591122553683817386627197265625);
+
+  // Student distribution with 6 degrees of freedom
+  distribution.setParameterAtIndex(6.0, 0);
+  assert_finite_integral_between_abscissas_is(&distribution, 4.0, 4.0, 0.0);
+  assert_finite_integral_between_abscissas_is(&distribution, 5.0, 4.0, 0.0);
+  assert_finite_integral_between_abscissas_is(&distribution, 4.0, 5.0, 0.002333318101494775250);
 }
 
 QUIZ_CASE(geometric_distribution) {
@@ -92,6 +117,12 @@ QUIZ_CASE(geometric_distribution) {
   distribution.setParameterAtIndex(0.2, 0);
   assert_cumulative_distributive_function_direct_and_inverse_is(&distribution, 7.0, 0.8322278399999998299563230830244719982147216796875);
   assert_cumulative_distributive_function_direct_and_inverse_is(&distribution, 3.0, 0.5904);
+
+  // Geometric distribution with probability of success 0.4
+  distribution.setParameterAtIndex(0.4, 0);
+  assert_finite_integral_between_abscissas_is(&distribution, 1.0, 1.0, 0.24);
+  assert_finite_integral_between_abscissas_is(&distribution, 2.0, 1.0, 0.0);
+  assert_finite_integral_between_abscissas_is(&distribution, 1.0, 2.0, 0.384);
 }
 
 QUIZ_CASE(fisher_distribution) {
@@ -115,4 +146,10 @@ QUIZ_CASE(fisher_distribution) {
   assert_cumulative_distributive_function_direct_and_inverse_is(&distribution, 1.4, 0.94560850441205857);
   assert_cumulative_distributive_function_direct_and_inverse_is(&distribution, 1.425, 0.95425004959692871775);
 
+  // Fisher distribution with d1 = 4 and d2 = 2
+  distribution.setParameterAtIndex(4.0, 0);
+  distribution.setParameterAtIndex(2.0, 1);
+  assert_finite_integral_between_abscissas_is(&distribution, 1.0, 1.0, 0.0);
+  assert_finite_integral_between_abscissas_is(&distribution, 2.0, 1.0, 0.0);
+  assert_finite_integral_between_abscissas_is(&distribution, 1.0, 2.0, 0.19555555555555555);
 }