# Compute Average Heights

This is a simple program to compute average heights. In a loop, it prompts the user for heights, inputs a text string and converts it to a ‘real’ number, sums them, and divides by the number of heights. Exit is signalled by negative height, after which the sum of the numbers is divided by the number of numbers. *There are (at least) 2 errors*. Find and fix!

#!/usr/bin/python3 # This is a simple program to compute average heights. # It prompts user for heights, sums them, and divides by the number of heights. # Exit is signalled by negative height. There are (at least) 2 errors. Find and fix! # Authour: Alan Richmond, Python3.codes sum = 0.0 num = 0 done = False while not done: height = float(input("Enter a height or 0: ")) if height < 0: done = True else: sum += height num += 1 print ("Average height is ", sum / num)

### Try it out:

Click on the **Forward** button. Use the scrollbars if necessary to see output.

In colloquial language, anaverageis the sum of a list of numbers divided by the number of numbers in the list. In mathematics and statistics, this would be called thearithmetic mean. However, the wordaveragemay also refer to the median, mode, or other central or typical value. In statistics, these are all known as measures of central tendency.