An investor has a $100,000 portfolio of which $75,000 has been invested in Stock A and the remainder in Stock B. Other characteristics of the portfolio are shown in the accompanying table. 
The standard deviation of the portfolio is ________.
Definitions:
Cooling Pad
a device used to reduce the operating temperature of electronic devices, notably laptops, by providing additional cooling.
Overheating
The condition of a device or component operating at a temperature above its intended maximum, often leading to malfunction or damage.
Software Development
The methodology of generating ideas, setting specifications, designing, writing code, keeping records, conducting tests, and fixing errors included in the production and maintenance of applications, frameworks, or different software elements.
Project Management
The practice of initiating, planning, executing, controlling, and closing the work of a team to achieve specific goals and meet specific success criteria.
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