A project consists of three activities with information as shown in the table.What is the overall standard deviation of the project? 
Definitions:
Unfreezing
The initial phase of change where previous behaviors, norms, or attitudes are questioned and destabilized to facilitate change.
Changing
The phase of Lewin’s planned change process where a planned change actually takes place.
Improvising
The act of spontaneously creating or performing something without prior planning, often in response to unforeseen circumstances.
Changing Phase
A period or stage in a process of transformation where significant alterations occur, leading from one state to a different one.
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