The parameter used in the probability is the average number of students represented by u. How to calculate the probability? The confidence interval based on the information will be: = 3.85 - 2.09(1.348 / ✓20) = 3.22 Also, 3.85 + 2.09(1.348 / ✓20) = 4.48 The confidence interval simply means that one is 95% confident that the true mean is between 3.22 and 4.48.
