A small software development project has five major activities. The times are estimated and provided in the table below. 
(a) What is the expected completion time for this project?
(b) What variance would be used in finding probabilities of finishing by a certain time?
Definitions:
Software Program
A collection of instructions that enable a computer to perform specific tasks or operations; also referred to as software applications or simply software.
Explanatory Variables
Independent variables in a statistical model that account for changes in the dependent variable.
Correlation
A numerical index showing how much two or more variables move in correlation with each other.
Regression Model
A statistical technique used to estimate the relationships among variables, often used to predict a dependent variable based on one or more independent variables.
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