The sample mean is always equal to the population mean whenever the sample mean is computed from 30 or more observations.

Question

Quizplus · Accepted Answer

The sample mean approximates the population mean, especially as sample size increases (due to the Central Limit Theorem), but it is not guaranteed to be equal to the population mean, regardless of the sample size. Variability in samples can still lead to differences between the sample mean and the population mean.

The Sample Mean Is Always Equal to the Population Mean