6. A bookstore wants to estimate the mean value of a card stored in inventory. A total of 100 cards were selected showing a mean of RM2.55 and a standard deviation of RM0.44. a. Assuming a normal...

6. A bookstore wants to estimate the mean value of a card stored in inventory. A total of 100 cards were selected showing a mean of RM2.55 and a standard deviation of RM0.44. a. Assuming a normal distribution, it forms a 95% confidence interval for the mean of all the cards in the inventory. b. Assume there are 2,500 cards in the inventory. How the decision in (a) can help the owner to estimate the value of his inventory.