A random sample of 20 health maintenance organizations (HMOs) was selected. For each HMO, the co-payment (in dollars) for a doctor's office visit was recorded. The results are as follows:

54, 34, 25, 34, 48, 44, 60, 27, 32, 47, 44, 42, 26, 57, 30, 37, 35, 33, 58, 32

Under the assumption that co-payment amounts are normally distributed, find a 95% confidence interval for the mean co-payment amount in dollars. Give the lower limit and upper limit of the 95% confidence interval.

Carry your intermediate computations to at least three decimal places. Round answers to one decimal place.