# Kotlin Program to Calculate Standard Deviation

In this program, you'll learn to calculate the standard deviation using a function in Kotlin.

This program calculates the standard deviation of a individual series using arrays. Visit this page to learn about Standard Deviation.

To calculate the standard deviation, `calculateSD()` function is created. The array containing 10 elements is passed to the function and this function calculates the standard deviation and returns it to the `main()` function.

## Example: Program to Calculate Standard Deviation

``````fun main(args: Array<String>) {
val numArray = doubleArrayOf(1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0)
val SD = calculateSD(numArray)

System.out.format("Standard Deviation = %.6f", SD)
}

fun calculateSD(numArray: DoubleArray): Double {
var sum = 0.0
var standardDeviation = 0.0

for (num in numArray) {
sum += num
}

val mean = sum / 10

for (num in numArray) {
standardDeviation += Math.pow(num - mean, 2.0)
}

return Math.sqrt(standardDeviation / 10)
}``````

When you run the program, the output will be:

`Standard Deviation = 2.872281`

In the above program, we've used the help of Math.pow() and Math.sqrt() to calculate the power and square root respectively.

Here's the equivalent Java code: Java program to calculate standard deviation.