Find average of a list in python
Prerequisites: sum() function, len() function, round() function, reduce(), lambda, and mean(). Given a list of numbers, the task is to find average of that list. Average is the sum of elements divided by the number of elements.
Input : [4, 5, 1, 2, 9, 7, 10, 8] Output : Average of the list = 5.75 Explanation: Sum of the elements is 4+5+1+2+9+7+10+8 = 46 and total number of elements is 8. So average is 46 / 8 = 5.75 Input : [15, 9, 55, 41, 35, 20, 62, 49] Output : Average of the list = 35.75 Explanation: Sum of the elements is 15+9+55+41+35+20+62+49 = 286 and total number of elements is 8. So average is 46 / 8 = 35.75
Using sum()
In Python we can find the average of a list by simply using the sum() and len() function.
- sum() : Using sum() function we can get the sum of the list.
- len() : len() function is used to get the length or the number of elements in a list.
Python3
# Python program to get average of a listdef Average(lst): return sum(lst) / len(lst) # Driver Codelst = [15, 9, 55, 41, 35, 20, 62, 49]average = Average(lst) # Printing average of the listprint("Average of the list =", round(average, 2)) |
Output:
Average of the list = 35.75
Using reduce() and lambda
We can use the reduce() to reduce the loop and by using the lambda function can compute summation of list. We use len() to calculate length as discussed above.
Python3
# Python program to get average of a list# Using reduce() and lambda # importing reduce()from functools import reduce def Average(lst): return reduce(lambda a, b: a + b, lst) / len(lst) # Driver Codelst = [15, 9, 55, 41, 35, 20, 62, 49]average = Average(lst) # Printing average of the listprint("Average of the list =", round(average, 2)) |
Output:
Average of the list = 35.75
Using mean()
The inbuilt function mean() can be used to calculate the mean( average ) of the list.
Python3
# Python program to get average of a list# Using mean() # importing mean()from statistics import mean def Average(lst): return mean(lst) # Driver Codelst = [15, 9, 55, 41, 35, 20, 62, 49]average = Average(lst) # Printing average of the listprint("Average of the list =", round(average, 2)) |
Output:
Average of the list = 35.75
By iterating list
Iterating list using for loop and doing operations on each element of list.
Python3
# Python code to get average of listdef Average(lst): sum_of_list = 0 for i in range(len(lst)): sum_of_list += lst[i] average = sum_of_list/len(lst) return average # Driver Codelst = [15, 9, 55, 41, 35, 20, 62, 49]average = Average(lst)print("Average of the list =", round(average, 2)) |
Output
Average of the list = 35.75
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