Question 4 (1 point) Suppose that the average and standard deviation of the shelf life in years for certain kinds of batteries are 12.59 and 2.91, respectively. Calculate an interval that is symmetric around the mean such that it contains approximately 68% of battery shelf lives. Assume that the life has a normal distribution. O 1) (12.59, 2.91) O 2) (6.77, 18.41) ( 3) (15.5, 9.68) ( 4) (9.68, 15.5) 5) (18.41, 6.77 )