3 deleted 1 character in body

# Scala, 676362 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


# Scala, 6763 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


# Scala, 6762 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

2 added 38 characters in body

# Scala, 6767 63 bytes

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


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

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


# Scala, 67 bytes

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


Requires input as a sequence/vector of tuples Example:

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


# 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

1

# Scala, 67 bytes

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


Requires input as a sequence/vector of tuples Example:

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