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 100 customers' lunch tabs gave a mean of $8.75 and a population standard deviation of $2.04.

Construct a 90% confidence interval for the average amount spent on lunch by all customers. Please show the answer to 2 decimal places.

A 90% confidence interval for the average amount spent on lunch by all customers is < <