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Average return, variance, standard deviation

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A recession is an example of systematic risk because it affects the pattern of a number of aspects (stock), what are some other examples of systematic risks?

Assume Company X has the following returns for years 1 to 5: -25, 36, 9, 11 and 17%. What would be:

a. the average return
b. the variance of the returns over the period
c. the standard deviation of the returns over the period

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The solution explains how to calculate average return, variance and standard deviation.

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Other examples would be

1. Interest rate changes
2. Increase in oil prices
3. War

All these would ...

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