VOLATILITY, in securities, is the measurement of the change in price over a given time period. It is often expressed as a percentage and computed as the annualized standard deviation of percentage change in daily price.

MEDIAN is the value of the midpoint variable when the data are arranged in ascending or descending order.

HEDGING is strategy focused upon reducing exposure to risk of loss resulting from fluctuations in exchange rates, commodity prices, interest rates etc. Hedging in securities is taking two positions that will offset each other if prices change, thereby limiting financial risk.

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