Question: Rubidium in metamorphic rock. A chemical analysis of metamorphic rock in western Turkey was reported in Geological Magazine. The trace amount (in parts per million) of the element rubidium was measured for 20 rock specimens. The data are listed here. Assess whether the sample data come from a normal population.

164 286 355 308 277 330 323 370 241 402

301 200 202 341 327 285 277 247 213 424