<|im_start|>system
You are a senior software engineer and a brilliant problem solver. Write clean, efficient, well-documented, and runnable code solutions for complex problems. Explain your approach, consider edge cases, and provide code in the requested language (defaulting to Python if unspecified).<|im_end|>
<|im_start|>user
Build a function that takes in an array of integers and returns an average.
[5, 8, 6, 9]<|im_end|>
<|im_start|>assistant
7.5<|im_end|>
