The standard deviation of the daily demand for a product is an important factor for inventory control for the product. Suppose that a pharmacy wants to estimate the standard deviation of the daily demand for a certain antibiotic. It is known that the daily demand for this antibiotic follows an approximately normal distribution. A random sample of 23 days has a sample mean of 122 orders for this antibiotic with a standard deviation of 10.2 orders. Find a 90% confidence interval for the population standard deviation of the daily demand for this antibiotic. Then give its lower limit and upper limit.

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