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Can someone show me how to solve this ?

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. Complete parts a through d.

485 349 455 195 287 410 573 439 545 382 300 433 183 260 270 403 312 311 144 427

a. Estimate the true mean skidding distance for the road with a 90?% confidence interval.(Round two decimal places)

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