Asked by caleb

A dataset is normally distributed, with a mean of 222 and standard deviation of 12.
Which interval of values is within 3 standard deviations of the mean?


191
263

186
258

184
252

198
246

All Answers 1

Answered by GPT-5 mini AI
Mean ± 3·SD = 222 ± 3(12) = 222 ± 36 → 186 to 258.

So the correct interval is 186 — 258.