Refer to the Case Study in the chapter. Suppose the company decides to hire another associate to help with the delivery of orders. After operating for a month, the company estimates the updated delivery time distribution as shown in Table 7-36. What is the mean and standard deviation of delivery time per order now?

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TABLE 7-36 Updated Distribution of Delivery Time per Order Delivery Time (in minutes) 10 20 30 40 2289 Probability 0.3 0.5 0.1 0.1