This figure shows the endocrine system. Which number indicates the thymus gland? 
Definitions:
Standard Deviation
A measure of the amount of variation or dispersion of a set of values, commonly used in finance to quantify the risk associated with a given investment.
Perfectly Negatively Correlated
A situation in which two variables move in opposite directions with a correlation coefficient of -1, implying that when one variable increases, the other decreases.
Risk-Free Portfolio
An investment group that is considered to have no risk of financial loss, typically represented by government bonds.
Expected Rate
The return that an investor anticipates or forecasts receiving on an investment over a set period.
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