He never knows for sure what profit, if any will be produced in the next hour, or any hour. All he knows are the probabilities as stated in the original question.
A stock day trader has a winning system and he wants to maximize his profit per hour. He has found that when he trades 5 hours a day, 90% of the time he will make 2 points profit or less and 10% of the time he will make more than 2 points profit. He knows that to earn the maximum total amount of...