Updated previous commit.

Author: occar421

Misc/ScopeFunctions/src/ReduceVariable.kt

@@ -1,5 +1,6 @@
 fun main(args: Array<String>) {
  val array = arrayOf(50, 60, 70, 70, 100)
- val variance = array.run { map { it * it }.average() - average() * average() }
+ val mean = array.run { sum() / count().toDouble() }
+ val variance = array.run { map { it * it }.run { sum() / count().toDouble() } - mean * mean }
  println(variance)
 }