Update sampling test to create the expected first

This matches the ContinuousDistributionAbstractTest
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ContinuousDistributionAbstractTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ContinuousDistributionAbstractTest.java
index b7e380b..c714397 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ContinuousDistributionAbstractTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ContinuousDistributionAbstractTest.java
@@ -520,15 +520,15 @@
 
     @Test
     void testSampling() {
+        final double[] quartiles = TestUtils.getDistributionQuartiles(getDistribution());
+        final double[] expected = {0.25, 0.25, 0.25, 0.25};
+
         // Use fixed seed.
         final int sampleSize = 1000;
         final ContinuousDistribution.Sampler sampler =
             getDistribution().createSampler(RandomSource.create(RandomSource.WELL_19937_C, 123456789L));
         final double[] sample = TestUtils.sample(sampleSize, sampler);
 
-        final double[] quartiles = TestUtils.getDistributionQuartiles(getDistribution());
-        final double[] expected = {250, 250, 250, 250};
-
         final long[] counts = new long[4];
         for (int i = 0; i < sampleSize; i++) {
             TestUtils.updateCounts(sample[i], counts, quartiles);