Data commit

Task/Cumulative-standard-deviation/Nanoquery/cumulative-standard-deviation.nanoquery

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+class StdDev
+	declare n
+	declare sum
+	declare sum2
+
+	def StdDev()
+		n = 0
+		sum = 0
+		sum2 = 0
+	end
+
+	def sd(x)
+		this.n += 1
+		this.sum += x
+		this.sum2 += x*x
+
+		return sqrt(sum2/n - sum*sum/n/n)
+	end
+end
+
+testData = {2,4,4,4,5,5,7,9}
+sd = new(StdDev)
+
+for x in testData
+	println sd.sd(x)
+end