Suppose a large labor union wishes to estimate the mean number of hours per month a union member is absent from work. The union decides to sample 351 of its members at random and monitor the working time of each of them for 1 month. At the end of the month, the total number of hours absent from work is recorded for each employee. If the mean and standard deviation of the sample are x̄ = 9.3 hours and s = 3.8 hours, find a 90% confidence interval for the true mean number of hours a union member is absent per month. Round to the nearest thousandth.