Exhibit 15.4
The following questions are based on the information below.
A company needs to manage a project which consists of the following set of activities: 
-A company wants to use PERT to manage a project. They have developed the following spreadsheet for the problem. What formula should go in cell F3 of the spreadsheet to compute the Activity Time when simulating a PERT analysis? 
Definitions:
Aortic Semilunar
Refers to the aortic semilunar valve in the heart, which prevents blood from flowing back into the left ventricle from the aorta.
Endocardium
The innermost layer of tissue that lines the chambers of the heart, providing a smooth surface for blood flow.
Epicardium
The outermost layer of the wall of the heart. Also known as the visceral pericardium.
Pericardium
A membrane that covers the heart and large blood vessels attached to it.
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