# Python Program to Calculate Sum and Average of n numbers

Sum and average of n natural numbers in python; Through this tutorial, you will learn how to how to find sum and average of n numbers in python program using for loop, while loop, function.

## Python Program to Find or Calculate Sum and Average of n numbers

• Python Calculate/Find the Sum and Average of n natural numbers using loop and range function.
• Find/Calculate Sum and Average of n natural numbers in python using while loop
• Python program to find/calculate the Sum and Average of numbers in a given list
• The mathematical formula to find/calculate the Sum and Average of n numbers with python program
• Python Program to Find/Calculate average and sum of n odd natural numbers
• Python Program to Find/Calculate average and sum of n even natural numbers

### 1: Python Find/Calculate the Sum and Average of n natural numbers using loop and range function

• Use a python input() function in your python program that takes an input from the user to enter the number (n) to calculate the sum.
• Next, declare variables that name sum, avg. avg will contain an average of n natural numbers average.
• Next, run loop till the entered number using the for loop and range() function.
• Inside a loop, calculate the sum of n numbers using a sum = sum+num formula.
• Next, calculate the average of n numbers using a average = sum / n formula.
• After the loop ends, print the sum, avg variable that contains the sum , average of n numbers
```n = input("Enter Number to calculate sum & average")

n = int (n)

sum = 0

for num in range(0, n+1, 1):
sum = sum+num

average = sum / n

print("SUM of", n, "numbers is: ", sum )
print("Average of", n, "natural number is: ", average)

```

Output:

```Enter Number to calculate sum & average 5
SUM of 5 numbers is:
15 Average of 5 natural number is:  3.0 ```

### 2: Find/Calculate Sum and Average of n natural numbers in python using while loop

Also, use the while loop in python to calculate the sum of n numbers.

• First of all, you can use a python input() function in your python program that takes input from a user to enter the number (n) to calculate the sum and average.
• Next, declare variables that name sum and avg. avg will contain the avg of n natural numbers sum.
• Run while loop until n is greater than zero
• Add the current value of n to sum variable. And, decrement n number by 1 in while loop body.
• Next, calculate the average of n numbers using a average = sum / n formula.
• After the loop finishes, the print sum and avg name variable.

#### Python program to find the sum and average of n numbers using While loop:

```n = input("Enter Number to calculate sum and average")

n = int (n)

totalNo = n

sum=0

while (n >= 0):
sum += n
n-=1

average  = sum / totalNo

print ("sum of ", totalNo ,"using while loop ", sum)

print ("average of", totalNo ,"using while loop ", average)
```

Output:

```Enter Number to calculate sum and average 5
sum of  5 using while loop  15
average of 5 using while loop  3.0 ```

### 3: Python program to Find/Calculate the sum and average of numbers in a given list

• Declare a variable that name avg and sum. Avg will contain the average of n natural numbers.
• Next, define list and assign a value to a python list.
• Run for a loop and Add the current value of n to sum variable.
• Next, calculate the average of n numbers.
• After the loop finishes, the print sum name variable.
```sum = 0

list = [11,4,5,7,99,10,12]

for num in list:
sum = sum +num

average  = sum / len(list)

print ("sum of list element is : ", sum)

print ("Average of list element is ", average )
```

Output:

```sum of list element is :  148
Average of list element is  21.142857142857142 ```

### 4: The mathematical formula to Find/Calculate the sum and Average of n numbers with python program

In the above programs, you have learned how to calculate the sum of n numbers using for loop, while loop and range function.

Now, you will learn how to calculate/find sum of n numbers in python without for loop, while loop in python. Calculate the sum directly using a mathematical formula in python program.

The sum of the n natural number mathematical formula is = `n * (n+1) / 2`.

In the below python program, you will learn how to use this mathematical formula is = `n * (n+1) / 2` to find/calculate sum of n numbers in python programs.

• Take input from user in your python program using input() function.
• Convert a user inputted number to an integer using int() function.
• Calculates sum of number by using this formula `n * (n+1) / 2` in your python program.
• Next, Calcuate average of numbers by using this formula average = ( n * (n+1) / 2) / n in your python program.
• After that, the print name sum variable.
```n = input("Enter a number to calculate average and sum")

n = int (n)

sum = n * (n+1) / 2

average  = ( n * (n+1) / 2) / n

print("Sum of fthe irst ", n, "natural numbers using formula is: ", sum )
print("Average of the first ", n, "natural numbers using formula is: ", average )
```

Output:

```Enter a number to calculate average and sum 5
Sum of fthe irst  5 natural numbers using formula is:  15.0
Average of the first  5 natural numbers using formula is:  3.0   ```

### 5: Python Program to Find/Calculate average and sum of n odd natural numbers

• Take input from user using python input() function in your python program.
• Next, declare a variable that name sum, it will contain the sum of n odd numbers.
• Next, run loop till the entered number using the for loop and range() function.
• Inside a loop, calculate the sum of n odd numbers using a `sum = sum + current number` formula with (not (num % 2) == 0).
• Next, calculate the average of n odd numbers.
• After the loop ends, print the sum variable that contains the sum of n odd numbers.

#### Python program to find average and sum of n odd numbers:

```n = input("Enter Number to calculate average and sum")

n = int (n)

sum = 0

for num in range(0, n+1, 1):

if(not (num % 2) == 0):
sum += num;

average  = sum / n

print("SUM of odd numbers is: ", sum )
print("Average of odd numbers is: ", average )
```

Output:

```Enter Number to calculate sum 5
SUM of odd numbers is:  9 ```

### 6: Python Program to Find/Calculate average and sum of n even natural numbers

• Take input from the user using python input() function in your python program.
• Next, declare a variable that name sum, it will contain the sum of n even numbers.
• Next, run loop till the entered number using the for loop and range() function.
• Inside a loop, calculate the sum of n even numbers using a `sum = sum + current number` formula with if test condition ((num % 2) == 0).
• Next, calculate the average of n even numbers.
• After the loop ends, print the sum variable that contains the sum of n even numbers.

#### Python program to find average and sum of n even numbers:

```n = input("Enter Number to calculate average and sum")

n = int (n)

sum = 0

for num in range(0, n+1, 1):

if((num % 2) == 0):
sum += num;

average  = sum / n

print("SUM of even numbers is: ", sum )
print("Average of even numbers is: ", average )
```

Output:

```Enter Number to calculate average and sum 5
SUM of even numbers is:  6
Average of even numbers is:  1.2 ```