I understand you're asking for a more detailed explanation of the distribution followed by the given expression assuming that are samples from a normal distribution. Here's the detailed breakdown:

The formula for the _____ Distribution is given as Et = N/n

Define the normal distribution.

The mean for the standard normal distribution is ____.

states that the sampling distribution of x is approximately normal when the sample is large.

What do you call the distribution formed when the mean of all possible sample means for a specific sample size  is calculated?*1 pointmean distribution of the sample meanfrequency distribution of the sample meansampling distribution of the sample meancumulative distribution of the sample mean