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
def Average[lst]:
return sum[lst] / len[lst]
lst =
[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
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
from functools import reduce
def
Average[lst]:
return reduce[lambda a, b: a + b, lst] / len[lst]
lst = [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
Using mean[]
The inbuilt function mean[] can be used to calculate the mean[ average ] of the list.
Python3
from statistics import mean
def Average[lst]:
return mean[lst]
lst = [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
By iterating list
Iterating list using for loop and doing operations on each element of list.
Python3
def 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
lst =
[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