Selective serotonin reuptake inhibitor. Selective serotonin reuptake inhibitors (SSRIs), also known as serotonin-specific reuptake inhibitors or serotonergic antidepressants,[1] are a class of drugs that are typically used as antidepressants in the treatment of major depressive disorder and anxiety disorders.
Then you're looking for the midpoint! The midpoint of a line segment is the point located midway between the endpoints of the line segment. This tutorial tells you about the midpoint of a line segment.
Finding midpoint in class interval to calculate mean for cumulative frequency graph. The formula for a midpoint of a class interval is the lowest range plus the highest range divided by two. So say you have a class interval of 5-9.9. You would calculate it this way: 5+9.9= 14.9/2 = 7.45 or approximately 7.5.