Apache Spark - Problem Solving - Compute Average

How to compute average?

Approach 1:

var rdd = sc.parallelize(Array(1.0,2,3, 4, 5 , 6, 7), 3);
var avg = rdd.reduce(_ + _) / rdd.count();

Approach 2:

var rdd = sc.parallelize(Array(1.0,2,3, 4, 5 , 6, 7), 3);
var rdd_count = rdd.map((_, 1))
var (sum, count) = rdd_count.reduce((x, y) => (x._1 + y._1, x._2 + y._2))
var avg = sum / count