Question

Write a python program to find the sum of the first n natural numbers, where the value of n is provided by the user. What is the sum of the first 200 numbers?

Write a program that finds the average of a series of numbers entered by the user. As in the previous problem, the program will first ask the user how many numbers there are. Note: the average should always be a float. What is the average of 10.2, 1.3, 5.4, 2.2, 5.5, and 14.2?

Answer 1

1. The Python program to find the sum of first n natural numbers with a sample output is provided below :

CODE :

num = int(input("Enter the value of n: "))
item = num
sum = 0

if num <= 0:
print("Enter a whole positive number!")
else:
while num > 0:
sum = sum + num
num = num - 1;
  
print("Sum of first", item, "natural numbers is: ", sum)

SAMPLE OUTPUT :

2. The Python program that finds the average of a series of numbers entered by the user is provided below :

CODE :

n=int(input("Enter the total number you want to enter:"))
sum=0
for i in range(n):
x=float(input("Enter the number:"))
sum=sum+x
avg=sum/n

print("Average=",avg)

SAMPLE OUTPUT :

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