Given the project data below,what is the standard deviation of durations for path A,B,C? 
Definitions:
Row Headings
The labels provided at the beginning of each row in a table or spreadsheet, often describing the data in that row.
Column Headings
The titles or labels used at the top of each column in tables or spreadsheets to describe the data contained within the column.
COUNT Aggregate Function
A function in SQL that returns the number of items in a group, often used in queries to count the number of records that match certain criteria.
Query Design View
A graphical interface in database software that allows users to design or modify queries by visually arranging tables and setting criteria.
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