How do you get the mid year average?

Linear regression r square? what are the difference between activity duration estimating and estimating the effort required to perform an activity? What is probability in risk management? Is the gender of the next baby born at a particular hospital categorical or numerical? What is the outcome if two coins are tossed and one number cube is rolled? What is the difference between risk behavior and cumulative risk? What happens if there is two medians? What does est mean when next to a date? How many times does 4 go into 14? How many eights are in a 52 card deck? If two fair dice are rolled what is the probability that the total number of spots shown is equal to 5? Is probability an exact science? How long are average size condoms? Segmenting a highly sensitive database results in? What is anothor term for measure of central tendency? What does repeatability mean? Is the Goal Attainment Scale parametric on nonparametric? Do pie charts operate on more than one data series at a time? What organizes data by place value? Standard deviation considered a crude measure of variance?