Photo by: Alila. Exocytosis is the cellular process in which intracellular vesicles in the cytoplasm fuse with the plasma membrane and release or secrete their contents into the extracellular space.
More generally, the formula for the 95% confidence interval on the mean is: Lower limit = M - (tCL)(sM) Upper limit = M + (tCL)(sM) where M is the sample mean, tCL is the t for the confidence level desired (0.95 in the above example), and sM is the estimated standard error of the mean.
The lower class boundary is the midpoint between 399 and 400, that is 399.5. The upper class boundary is the midpoint between 499 and 500, that is 499.5. Class Intervals. Class interval is the difference between the upper and lower class boundaries of any class.