6. The mean sales and standard deviation of two types of gasoline in a certain gasoline station are summarized in the table. (5 Points) a. 3,803.47 and -1,003.47 b. 8,303.47 and 5,300.23 c. 3,803.47 and 1,003.47 d. 8,303.47 and -5,300.23 none of the choices The mean sales and standard deviation of two types of gasoline in a certain gasoline station are summarized in the table. Mean Sales Number of Selling Types of Gasoline Standard Devlation Days Premium = 10,400 Pesos = 2,500 Pesos n-10 days Regular i = 11, 800 Pesos 5z = 3,600 Pesos n=10 days Determine the 95% confidence interval for the difference between the two types of gasoline. (one tailed)