diff --git a/src/test/java/org/apache/commons/math/distribution/CauchyDistributionTest.java b/src/test/java/org/apache/commons/math/distribution/CauchyDistributionTest.java
index 3aa50296c..b2ae24b44 100644
--- a/src/test/java/org/apache/commons/math/distribution/CauchyDistributionTest.java
+++ b/src/test/java/org/apache/commons/math/distribution/CauchyDistributionTest.java
@@ -115,16 +115,15 @@ public class CauchyDistributionTest extends ContinuousDistributionAbstractTest
     }
 
     public void testMomonts() {
-        final double tol = 1e-9;
         CauchyDistribution dist;
         
         dist = new CauchyDistributionImpl(10.2, 0.15);
-        assertEquals(dist.getNumericalMean(), Double.NaN, tol);
-        assertEquals(dist.getNumericalVariance(), Double.NaN, tol); 
+        assertTrue(Double.isNaN(dist.getNumericalMean()));
+        assertTrue(Double.isNaN(dist.getNumericalVariance())); 
         
         dist.setMedian(23.12);
         dist.setScale(2.12);
-        assertEquals(dist.getNumericalMean(), Double.NaN, tol);
-        assertEquals(dist.getNumericalVariance(), Double.NaN, tol);
+        assertTrue(Double.isNaN(dist.getNumericalMean()));
+        assertTrue(Double.isNaN(dist.getNumericalVariance()));
     }
 }
diff --git a/src/test/java/org/apache/commons/math/distribution/FDistributionTest.java b/src/test/java/org/apache/commons/math/distribution/FDistributionTest.java
index 630419b59..52427db99 100644
--- a/src/test/java/org/apache/commons/math/distribution/FDistributionTest.java
+++ b/src/test/java/org/apache/commons/math/distribution/FDistributionTest.java
@@ -134,13 +134,13 @@ public class FDistributionTest extends ContinuousDistributionAbstractTest {
         FDistribution dist;
         
         dist = new FDistributionImpl(1, 2);
-        assertEquals(dist.getNumericalMean(), Double.NaN, tol);
-        assertEquals(dist.getNumericalVariance(), Double.NaN, tol); 
+        assertTrue(Double.isNaN(dist.getNumericalMean()));
+        assertTrue(Double.isNaN(dist.getNumericalVariance())); 
         
         dist.setNumeratorDegreesOfFreedom(1);
         dist.setDenominatorDegreesOfFreedom(3);
         assertEquals(dist.getNumericalMean(), 3d / (3d - 2d), tol);
-        assertEquals(dist.getNumericalVariance(), Double.NaN, tol);
+        assertTrue(Double.isNaN(dist.getNumericalVariance()));
         
         dist.setNumeratorDegreesOfFreedom(1);
         dist.setDenominatorDegreesOfFreedom(5);
diff --git a/src/test/java/org/apache/commons/math/distribution/TDistributionTest.java b/src/test/java/org/apache/commons/math/distribution/TDistributionTest.java
index 8360c6172..ca6c8c98c 100644
--- a/src/test/java/org/apache/commons/math/distribution/TDistributionTest.java
+++ b/src/test/java/org/apache/commons/math/distribution/TDistributionTest.java
@@ -121,12 +121,12 @@ public class TDistributionTest extends ContinuousDistributionAbstractTest {
         TDistribution dist;
         
         dist = new TDistributionImpl(1);
-        assertEquals(dist.getNumericalMean(), Double.NaN, tol);
-        assertEquals(dist.getNumericalVariance(), Double.NaN, tol); 
+        assertTrue(Double.isNaN(dist.getNumericalMean()));
+        assertTrue(Double.isNaN(dist.getNumericalVariance())); 
         
         dist.setDegreesOfFreedom(1.5);
         assertEquals(dist.getNumericalMean(), 0, tol);
-        assertEquals(dist.getNumericalVariance(), Double.POSITIVE_INFINITY, tol);
+        assertTrue(Double.isInfinite(dist.getNumericalVariance()));
         
         dist.setDegreesOfFreedom(5);
         assertEquals(dist.getNumericalMean(), 0, tol);