// `main.rs` to run this code.
// **Exercise**: Write a funtion `vec_avg` that computes the average value of a `Vec<i32>`.
// `main.rs` to run this code.
// **Exercise**: Write a funtion `vec_avg` that computes the average value of a `Vec<i32>`.
// *Hint*: `vec.len()` returns the length of a vector `vec`.
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// *Hint*: `vec.len()` returns the length of a vector `vec`.
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