PA 14-8 (Algo) EShack sells an ergonomic keyboard... Use Appendix 14A EShack sells an ergonomic keyboard in one of its stores. Average weekly demand for this keyboard follows a Poisson distribution with mean 1.9 unit. It submits orders to the supplier weekly and the supplier delivers with a 1-week lead time. (Round your answer to 4 decimal places.) d. Suppose it uses an order-up-to level of 8 . What is its in-stock probability? (Round your answer to 4 decimal places.) e. Suppose it uses an order-up-to level of 5 . What is its stockout probability? f. Suppose it wants a 0.935 in-stock probability. What should its order-up-to level be