A group of researchers wants to estimate the true mean skidding distance along a new road in a certain forest. The skidding distances​ (in meters) were measured at 20 randomly selected road sites. These values are given in the accompanying table. 488 348 459 199 285 410 572 439 546 381   295 435 183 260 270 404 310 310 145 423             a. Estimate the true mean skidding distance for the road with a 90​% confidence interval.   (____,_____) ​(Round to one decimal place as​ needed.)

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