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Moving Average from Data Stream

Given a stream of integers and a window size k, calculate the moving average of the last k values each time a new value arrives.

You will receive the window size and a sequence of values. For each value, output the moving average with 2 decimal places.

Input:

3
1,10,3,5

Output:

1.00
5.50
4.67
6.00

Reasoning:

Initially, the window size k is set to 3, and the first value 1 arrives, so the moving average is $1.00 = \frac{1}{1}$ .
When the second value 10 arrives, the window contains [1, 10], so the moving average is $\frac{1+10}{2} = 5.50$ .
The third value 3 arrives, and the window becomes [1, 10, 3], so the moving average is $\frac{1+10+3}{3} = 4.67$ .
Finally, the fourth value 5 arrives, and the window updates to [10, 3, 5], so the moving average is $\frac{10+3+5}{3} = 6.00$ .

Editor

Python 3.13.1

0/0

Run code to see test results.