What is the standard deviation of a portfolio which is comprised of $4,500 invested in stock S and $3,000 in stock T? 
Definitions:
Equilibrium Constant
A numerical value that represents the ratio of the concentrations of products to reactants at equilibrium in a chemical reaction.
Products
Substances that are formed as the result of a chemical reaction, located on the right side of a chemical equation.
Reactants
Compounds available at the start of a chemical reaction, which are utilized to form the final products.
Equilibrium Constant
A numerical value that represents the ratio of concentrations of products to reactants at equilibrium in a chemical reaction.
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