[Math] AbstractIntegerDistribution.inverseCumulativeDistribution Unexpected Result

[Ole Ersoy]

Hi,

I ran the following assertions on the dice distribution in the 
AbstractIntegerDistributionTest:

        Assert.assertEquals(3, 
diceDistribution.inverseCumulativeProbability(0.7d/6d));  //Expecting 1
        Assert.assertEquals(3, 
diceDistribution.inverseCumulativeProbability(0.8d/6d));  //Expecting 1
        Assert.assertEquals(3, 
diceDistribution.inverseCumulativeProbability(0.9d/6d));  //Expecting 1
        Assert.assertEquals(3, 
diceDistribution.inverseCumulativeProbability(1d/6d));    //Expecting 2
        Assert.assertEquals(3, 
diceDistribution.inverseCumulativeProbability(1.5d/6d));  //Expecting 2
        Assert.assertEquals(3, 
diceDistribution.inverseCumulativeProbability(2d/6d));    //Expecting 2
        
        Assert.assertEquals(3, 
diceDistribution.inverseCumulativeProbability(2.9d/6d));  //Expecting 3
        Assert.assertEquals(3, 
diceDistribution.inverseCumulativeProbability(3.0d/6d));  //Expecting 4
        Assert.assertEquals(4, 
diceDistribution.inverseCumulativeProbability(3.1d/6d));
        
        Assert.assertEquals(4, 
diceDistribution.inverseCumulativeProbability(3.2d/6d));         
        Assert.assertEquals(4, 
diceDistribution.inverseCumulativeProbability(3.5d/6d));

        Assert.assertEquals(4, 
diceDistribution.inverseCumulativeProbability(4.0d/6d)); //Expecting 5
        Assert.assertEquals(4, 
diceDistribution.inverseCumulativeProbability(5.0d/6d)); //Expecting 5
        Assert.assertEquals(4, 
diceDistribution.inverseCumulativeProbability(5.1d/6d)); //Expecting 5
        Assert.assertEquals(5, 
diceDistribution.inverseCumulativeProbability(5.5d/6d));
        Assert.assertEquals(6, 
diceDistribution.inverseCumulativeProbability(6.0d/6d));

All of them pass.  Thoughts?

Cheers,
- Ole

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