help!! Weekly demand for cell phones at a retailer is normally distributed with a mean of $150$ phones and a standard deviation of $75.$ The retailer replenishes inventory by ordering from a distributor, with a lead time of two weeks. Currently, the store continuously monitors the inventory of phones and achieves an in$-$stock probability of $95\%$ If the fixed ordering cost from the supplier is $$100,$ and the weekly holding cost per phone is valued at $$1\mathrm{.}50.$ What should be the optimal order quantity?Weekly demand for cell phones at a retailer is normally distributed with a mean of $150$ phones and a standard deviation of $75.$ The retailer replenishes inventory by ordering from a distributor, with a lead time of two weeks. Currently, the store continuously monitors the inventory of phones, and achieves an in$-$stock probability of $95\%.$ If the fixed ordering cost from the supplier is $$100,$ and the weekly holding cost per phone is valued at $$1\mathrm{.}50.$ What should be the optimal order quantity?