Rust struct for calculating the running average(mean)

gistfile1.txt

use std::num::{ zero, one };

struct Mean {
  mean: f64,
  count: u64,
}
 
impl Mean {
  fn consider(&mut self, other: f64) {
    self.count = self.count + one();
    let delta = other - self.mean;
    self.mean = self.mean + (delta / self.count as f64);
  }
  fn mean(&self) -> f64 {
    self.mean
  }
  fn new() -> Mean {
    Mean { mean: zero(), count: zero() }
  }
}