# How do I construct a 95% confidence interval for the average amount spent on lunch by all customers?

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The Roman Arches is an Italian restaurant. The manager wants to estimate the average amount a customer spends on lunch Monday through Friday. A random sample of 115 customers' lunch tabs gave a mean of $9.74 and a population standard deviation of $2.93.

The Roman Arches is an Italian restaurant. The manager wants to estimate the average amount a customer spends on lunch Monday through Friday. A random sample of 115 customers' lunch tabs gave a mean of $9.74 and a population standard deviation of $2.93.

##### 1 Answer

Dec 3, 2017

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#### Explanation: