Answer :
Given :
The population mean $(μ) = 520$
The population standard deviation $(σ) = 120$
The sample size $(n) = 100$
Solution :
$$\sigma_{\bar{x}} = \frac{\sigma}{\sqrt{n}} \ = \frac{120}{\sqrt{100}} \ = 12$$
The entrance exam for business schools, the GMAT, given to 100 students had a mean of 520 and a standard deviation of 120. What was the standard error for the mean of this sample of students?
