18. To estimate the salt content of popcorn cups, a sample 51 36 48 70 54 BO of 6 cups of popcorns was randomly selected and the amount of sodium per cup was measured to get the data collected in the table to the right. Calculate the 90% confidence interval for the average amount of sodium per popcorn cup in the population A (43.42 , 67 -41) B (43. 42, 69.58) C (45.59, 69. 58) D (45.59, 69.41)