Poll Participation Rate

PandasEasyJunior level~10 min

Problem

A community app runs polls. `resident` lists everyone eligible to vote (`resident_id`, `resident_name`); `ballot` records which residents voted in which poll (`poll_id`, `resident_id`, together unique).\n\nFor each poll, report what share of all residents voted in it, as a value out of 100 rounded to **two decimals** and aliased `participation`. Order by `participation` descending; break ties by `poll_id` ascending.

Input data

Example rows — the live problem includes the full dataset.

resident

resident_id	resident_name
6	Noor
2	Bram
7	Kiana

ballot

poll_id	resident_id
315	6
309	2
308	2
310	6
308	6

Expected output

Your answer should return 5 rows with the columns poll_id, participation.

Starter code (Pandas (Python))

import pandas as pd

def poll_participation(resident, ballot) -> pd.DataFrame:
    # Your code here
    return resident

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