input: from typing import List
  
  
  def generate_voltage_signal(frequency: float, amplitude: float, noise_std: float, duration: float, samples: int) -> List[float]:
      """ Generate a voltage signal with random noise based on the given frequency, amplitude, noise standard deviation, duration, and number of samples.
      >>> generate_voltage_signal(250, 1, 0.1, 1, 1000)
      [1.092345, -1.023456, ... , 0.987654]
      """
      t = np.linspace(0, duration, samples)
      voltage_signal = amplitude * np.sin(2 * np.pi * frequency * t) + np.random.normal(0, noise_std, samples)
      return voltage_signal.tolist()
output:     import numpy as np