A dairy farmer has a large herd of cows that produced milk. The farmer knows 10% of the cows produce over 35 liters per day. A business analyst for a local bank was asked to produce a model for the milk production of the farmers herd. He suggested that the milk production for a randomly selected cow from the farmers herd should be normally distributed with a mean 20 liters and standard deviation of 4 liters. Based on what the farmer knows is the business analyst's model appropriate for farmer's herd? Explain your reasoning.