Randomizate bullets help

How can i randomizate the bullets in this script ?

using UnityEngine;
using System.Collections;

public class EnemyAAi : MonoBehaviour {
public Transform target;
private float speed = 0;
public float normalSpeed = 0;
public float maxSpeed = 0;
public float rotateSpeed = 0;

public float lookAtDistance = 80;
public float attackRange = 40;


private Transform myTransform;
private bool moveForward = false;

public Rigidbody bullet;
public float bulletSpeed = 0;
public AudioClip laserSound;
public Transform muzzle;

public float attackTimer = 1;
private float timer = 0;

// Use this for initialization
void Start () 
{
	myTransform = transform;

}

// Update is called once per frame
void Update () 
{
	//40 to attack
	//80 to look
	float distance = Vector3.Distance(target.position, myTransform.position);
	
	
	
	if(distance < lookAtDistance)
	{
		LookAtTarget();
		speed = maxSpeed;
		moveForward = true;
		
		
		if(distance <= attackRange)
		{
			moveForward = false;
			//attack code
			TimeStuff();
		}
		
		
	}
	else
	{
		moveForward = false;
	}
	
	

	//this is for making shure the ship moves and stops
	if(moveForward)
	{
		MoveToTarget();
	}
	else
	{
		return;
	}

	

	
	
	
}


//move towards player
private void MoveToTarget()
{
	rigidbody.AddForce(myTransform.forward * speed);	
	
}
//look at player
private void LookAtTarget()
{
	//myTransform.LookAt(target);
	Quaternion rotation = Quaternion.LookRotation(target.position - myTransform.position);
	myTransform.rotation = Quaternion.Slerp(myTransform.rotation, rotation, rotateSpeed * Time.deltaTime);
			
}


private void ShootBullet()
{
	Rigidbody clone;
	clone = Instantiate(bullet, muzzle.position,muzzle.rotation) as Rigidbody;
	clone.velocity = transform.forward * 100;
	clone.transform.parent = transform;
	
	
	
	
	timer = attackTimer;
	
	
}


private void TimeStuff()
{
	//making shure timer is doing what is supposed to do
	if(timer <= 0)
	{
		timer = 0;
	}
	
	if(timer > 0)
	{
		timer -= Time.deltaTime;
	}
	
	if(timer == 0)
	{
		ShootBullet();
	}
	

}

public float health=100; //the health variable.
public float damage=10; //damage amount.
public void hit()
{
health-= damage;
if (health < 0)
{
}

}
}

You say you want to randomize the speed:

private void ShootBullet()
{
    Rigidbody clone;
    clone = Instantiate(bullet, muzzle.position,muzzle.rotation) as Rigidbody;
    float speed = Random.Range(minSpeed, maxSpeed); // HERE
    clone.velocity = transform.forward * speed;
    clone.transform.parent = transform;
    timer = attackTimer;
}

Is that what you meant? Now each time you instatiate a bullet a random value between the two given will be used for speed.

Thanks Alot, works PERFECT!!!