CALL OPTION is the right to buy a security within a fixed period of time at a fixed price.
MEAN is the measure of central tendency; also called the average. It is calculated by the sum of the data points divided by the number of data points.
WHEN-ISSUED, in securities, is a transaction made conditionally because a security, although authorized, has not yet been issued, e.g, new issues of stocks or bonds, stocks that have been split and Treasury securities are all traded on a when-issued basis.
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