Using the data in the table: $,$ a$.$ What was the average annual return of Microsoft stock from $2005-2021?$ b$.$ What was the annual volatility for Microsoft stock from $2005-2021?$ a$.$ What was the average annual return of Microsoft stock from $2005-2021?$ The average annual return was $21\mathrm{.}79\backslash \%.($Round to two decimal places.$)$ b$.$ What was the annual volatility for Microsoft stock from $2005-2021?$ The variance of returns was $.($Round to six decimal places.$)$

Data table

$*$Total dividends paid by the $500$ stocks in the portfolio, based on the number of shares of each stock in the index,

adjusted until the end of the year, assuming they were reinvested when paid.

Source: Standard & Poor's, Microsoft, and U$.$S$.$ Treasury Data

Please $($Round to six decimal$$ places.$)$