Question: When a customer orders, it predicts the wait time range. In the restaurant, the predicted range is 5 to 15 minutes. The manager has repeatedly

When a customer orders, it predicts the wait time range. In the restaurant, the predicted range is 5 to 15 minutes. The manager has repeatedly sampled the times customers wait and found the average time to be 7 min and the standard deviation 4 min, normally distributed. Customers like some anticipation and can tolerate some waiting. However, when the wait ends up being longer than 10 minutes, they provide negative reviews. What is the proability of a defect?

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