Fix variance formula #5
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Variance calculation and its dependent values seem to be off.
Ex.
Old:
scala> val oldS = new org.scalaml.stats.Stats((0 to 10).toArray)
oldS: org.scalaml.stats.Stats[Int] = org.scalaml.stats.Stats@2c8038d8
scala> oldS.variance
res5: Double = 38.27272727272727
scala> oldS.stdDev
res6: Double = 6.186495556672394
New:
scala> val s = Stats(0 to 10)
s: Stats[Int] = Stats(Range(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10))
scala> s.variance
res3: Double = 11.0
scala> s.stdDev
res4: Double = 3.3166247903554
update: Nevermind.