其它
\textbf{At a certain restaurant, the distribution of wait times between ordering a meal and receiving the meal has mean 11.4 minutes and standard deviation 2.6 minutes. The restaurant manager wants to find the probability that the mean wait time will be greater than 12.0 minutes for a random sample of 84 customers. Assuming the wait times among customers are independent, which of the following describes the sampling distribution of the sample mean wait time for random samples of size 84 ?} 
Overseas Competition->Knowledge Point->Calculation Modules
\textbf{For a sufficiently large n, the sampling distribution of $$\bar\_{X}$$ is approximately normal, with mean $\mu\_{\bar\_{X}}=\mu$ and standard deviation $\sigma\_\bar\_{X}=\sqrt{\frac{\sigma}{\sqrt{n}}}$} 