On each trial of an experiment, a subject is presented with a constant soft noise, which is interrupted at some unpredictable time by a noticeably louder sound. The time it takes for the subject to react to this louder sound is recorded. The following list contains the reaction times (in milliseconds) for the

19

trials of this experiment:

285

,

229

,

261

,

226

,

241

,

171

,

164

,

231

,

250

,

235

,

193

,

296

,

175

,

217

,

202

,

273

,

257

,

269

,

212

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Find

30th

and

75th

percentiles for these reaction times. (If necessary, consult a list of formulas.)

(a) The 30th percentile:	milliseconds
(b) The 75th percentile:	milliseconds