Function mean

performance-metrics/src/main.rs:331–339

(data: &[f64])

}

fn mean(data: &[f64]) -> Option<f64> {
    let count = data.len();

    if count > 0 {
        Some(data.iter().sum::<f64>() / count as f64)
    } else {
        None
    }
}

fn std_deviation(data: &[f64]) -> Option<f64> {
    let count = data.len();