A covariance is a statistical tool that is used to determine the relationship between the movement of two asset prices. When two stocks tend to move together, they are seen as having a positive covariance
$$Ans.Population\ Covariance\ Estimate = 2.25$$
$$Cov(X, Y) = E[X*Y] – E[X]*E[Y]$$
Covariance quantifies the directional connection between the profits on two resources. A positive covariance implies that resource returns move together while a negative covariance implies they move conversely. Covariance is determined by breaking down at-return shocks (standard deviations from the normal return) or by increasing the connection between's the two factors by the standard deviation of every factor.
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Covariance is a factual device that is utilized to decide the connection between the development of two resource costs. At the point when two stocks will in general move together, they are viewed as having a positive covariance; when they move contrarily, the covariance is negative. Covariance is a huge instrument in present day portfolio hypothesis used to learn what protections to place in a portfolio.
Danger and instability can be decreased in a portfolio by blending resources that have a negative covariance.
Covariance assesses how the mean estimations of two factors move together. On the off chance that stock A's return moves higher at whatever point stock B's return moves higher and a similar relationship is discovered when each stock's return diminishes, at that point these stocks are said to have positive covariance. In money, covariances are determined to help enhance security possessions.
At the point when an expert has a bunch of information, a couple of x and y esteems, covariance can be determined utilizing five factors from that information. They are:
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