The table below shows historical annual returns for stocks of companies X and Y over recent years. Calculate the arithmetic average returns. In addition, calculate their historical variances, as well as their historical standard deviations.

Returns

Year X Y

$112\%25\%$

$23046$

$319-7$

$4-20-21$

$52154$

Requirement $1$:

$($a$)$ The arithmetic average return of company X$\text{'}$s stock is:

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$($b$)$

The arithmetic average return of company Y$\text{'}$s stock is:

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Requirement $2$:

$($a$)$ The historical variance of company X$\text{'}$s stock returns is: $($Do not round intermediate calculations.$)$

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$($b$)$ The historical variance of company Y$\text{'}$s stock returns is: $($Do not round intermediate calculations.$)$

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Requirement $3$:

$($a$)$

The historical standard deviation of company X$\text{'}$s stock returns is: $($Do not round intermediate calculations.$)$

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$($b$)$

The historical standard deviation of company Y$\text{'}$s stock returns is: $($Do not round intermediate calculations.$)$

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