# Python Math: Calculate the standard deviation

## Python Math: Exercise-57 with Solution

Write a Python program to calculate the standard deviation of the following data.

**Sample Solution**:-

**Python Code:**

```
import math
import sys
def sd_calc(data):
n = len(data)
if n <= 1:
return 0.0
mean, sd = avg_calc(data), 0.0
# calculate stan. dev.
for el in data:
sd += (float(el) - mean)**2
sd = math.sqrt(sd / float(n-1))
return sd
def avg_calc(ls):
n, mean = len(ls), 0.0
if n <= 1:
return ls[0]
# calculate average
for el in ls:
mean = mean + float(el)
mean = mean / float(n)
return mean
data = [4, 2, 5, 8, 6]
print("Sample Data: ",data)
print("Standard Deviation : ",sd_calc(data))
```

Sample Output:

Sample Data: [4, 2, 5, 8, 6] Standard Deviation : 2.23606797749979

**Pictorial Presentation:**

**Flowchart:**

**Python Code Editor:**

**Have another way to solve this solution? Contribute your code (and comments) through Disqus.**

**Previous:** Write a Python program to calculate the absolute value of a floating point number.

**Next:** Write a Python program to print the floating point from mantissa, exponent pair.

**What is the difficulty level of this exercise?**

Test your Programming skills with w3resource's quiz.

## Python: Tips of the Day

**Given each iterable to construct a tuple by adding an index:**

>>> a = ['Hello', 'world', '!'] >>> list(enumerate(a)) [(0, 'Hello'), (1, 'world'), (2, '!')]

**Weekly Trends**- Python Interview Questions and Answers: Comprehensive Guide
- Scala Exercises, Practice, Solution
- Kotlin Exercises practice with solution
- MongoDB Exercises, Practice, Solution
- SQL Exercises, Practice, Solution - JOINS
- Java Basic Programming Exercises
- SQL Subqueries
- Adventureworks Database Exercises
- C# Sharp Basic Exercises
- SQL COUNT() with distinct
- JavaScript String Exercises
- JavaScript HTML Form Validation
- Java Collection Exercises
- SQL COUNT() function
- SQL Inner Join

We are closing our Disqus commenting system for some maintenanace issues. You may write to us at reach[at]yahoo[dot]com or visit us at Facebook