Problem 60831. "Identify and Replace Outliers in a Numeric Array"

Created by Parth Gosavi

Difficulty:Rate

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Given a numeric array, identify outliers that are more than two standard deviations away from the mean and replace them with the mean of the non-outlier values.
Example: 
Input:
x = [10, 12, 11, 50, 13, 9, 12, 8, 11, 200];
Processing:
The mean and standard deviation of the array are calculated.
Values that are more than 2 standard deviations from the mean are considered outliers.
Outliers are replaced by the mean of the remaining non-outlier elements.
Output:
y = [10, 12, 11, 13, 13, 9, 12, 8, 11, 13];

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12 Solutions
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Last Solution submitted on May 17, 2025

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1 Comment

Dyuman Joshi on 8 Jun 2025

@Parth, few pointers -

1. Many of your test cases are redundant - you are comparing 2 same/identical things to each other, just with a different identifier. Thus the assert() statement will always pass regardless of the output (FYI - people have used this fact to kinda hack the problem). I suggest you go through them again and correct them.

2. It would be better to use tolerance to compare the arrays.

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