More RDD Ops - There is an RDD r having decimal numbers. Which one...

There is an RDD r having decimal numbers. We want to compute the average of the numbers. Which of the following methods has only one action and will perform faster than the other?

r.reduce(_ + _ )/r.count()
var v = r.aggregate((0, 0))((t, i) => (t._1 + i, t._2 + 1), (t1, t2) => (t1._1 + t2._1, t1._2 + t2._2)); v._1/v._2

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