There isn't a average dose of insulin, too many variables, such as weight, activity, insulin assistance, and food you eat etc... So basically you need what you need to control your diabetes..
An rule of thumb, and what is often used as a starting point, it's said that for every 1kg of body weight a T1 will use between 0.5-0.8 unit's of insulin per day.. But this is only a rough guide as different insulin have slightly different, amount used for a 1kg of weight......