Write an average-income function
Quick Overview
This question evaluates proficiency in data manipulation and basic statistical aggregation, particularly handling missing values and computing averages in Python. Commonly asked in technical interviews for Data Scientist roles within the Coding & Algorithms domain, it gauges practical application and robustness in data cleaning and edge-case handling rather than purely conceptual theory.
Microsoft
Apr 1, 2026, 12:00 AM
Data Scientist
Technical Screen
Coding & Algorithms
1
0
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Given a Python list of dictionaries such as:
records = [{"name": "a", "income": 100}, {"name": "b", "income": None}, {"name": "a", "income": 200}]
Write a function that returns the average of all non-missing income values.
Requirements:
-
Ignore any record where
incomeisNone. -
The
namefield does not affect the calculation. -
If there are no valid income values, return
None.