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added 38 characters in body

edited Jan 30, 2016 at 19:22

Scala, 67 63 bytes

def e(a:(Int, Int)*)=math.sqrt(a map(x=>x._2-x._1)map(x=>x*x)sum)

Requires input as a ~~sequence/vector of~~ var-arg tuples
Example:

scala> e((1, 5), (2, 6), (3, 7), (4, 8)) res1: Double = 8.0

answered Jan 30, 2016 at 15:23