Python: Find the weighted average of two or more numbers
Python List: Exercise - 254 with Solution
Write a Python program to get the weighted average of two or more numbers.
A weighted average is an average in which some of the items to be averaged are 'more important' or 'less important' than some of the others. The weights are (non-negative) numbers which measure the relative importance
For example, the weighted average of a list of numbers x1,…,xn with corresponding weights w1,…,wn is
- Use sum() to sum the products of the numbers by their weight and to sum the weights.
- Use zip() and a list comprehension to iterate over the pairs of values and weights.
def weighted_average(nums, weights): return sum(x * y for x, y in zip(nums, weights)) / sum(weights) nums1 = [10, 50, 40] nums2 = [2, 5, 3] print("Original list elements:") print(nums1) print(nums2) print("\nWeighted average of the said two list of numbers:") print(weighted_average(nums1, nums2)) nums1 = [82, 90, 76, 83] nums2 = [.2, .35, .45, 32] print("\nOriginal list elements:") print(nums1) print(nums2) print("\nWeighted average of the said two list of numbers:") print(weighted_average(nums1, nums2))
Original list elements: [10, 50, 40] [2, 5, 3] Weighted average of the said two list of numbers: 39.0 Original list elements: [82, 90, 76, 83] [0.2, 0.35, 0.45, 32] Weighted average of the said two list of numbers: 82.97272727272727
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Python: Tips of the Day
When we speak of division we normally mean (/) float division operator, this will give a precise result in float format with decimals.
For a rounded integer result there is (//) floor division operator in Python. Floor division will only give integer results that are round numbers.
print(1000 // 300) print(1000 / 300)
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