bench: refactor number generation

[hrshya]

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• task: run_cpp_examples status: na
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Resolves #5147 .

Description

What is the purpose of this pull request?

This pull request:

• Updates the benchmarks in the kurtosis directory Address commit comments (commit 0806d8d) #5147 .

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves no related issues.

Questions

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No.

Other

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No.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/uniform/kurtosis	$\color{green}186/186$ $\color{green}+100.00\%$	$\color{green}9/9$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}186/186$ $\color{green}+100.00\%$

The above coverage report was generated for the changes in this PR.

[Planeshifter]

Closing since this has already been addressed as part of PR #5176.