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The mean waiting time at the drive-through of a fast-food restaurant from the time an order is placed to the time the order is received

The mean waiting time at the drive-through of a fast-food restaurant from the time an order is placed to the time the order is received is 85.8seconds. A manager devises a new drive-through system that hebelieves will decrease wait time. As a test, heinitiates the new system at hisrestaurant and measures the wait time for10randomly selected orders. The wait times are provided in the table to the right. Complete parts (a) and (b) below.

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