$1)$ Over the past $4$ years an investment returned $0\mathrm{.}1,-0\mathrm{.}12,-0\mathrm{.}08,$& $0\mathrm{.}13.$ What is the standard deviation of returns? $($Input $4$ decimal digits, not percentage$)$

$2)$ Stock A has an expected return of $20\%$; stock B has an expected return of $5\%.$ What is the expected return on a portfolio that is comprised of $67\%$ of stock A & $33\%$ of stock B$?($Two decimal percentage$)$

$3)$ A stock is expected to pay dividends of $$1\mathrm{.}45$ per share in year $1$ & $$1\mathrm{.}68$ per share in year $2.$ After that, the dividend is expected to increase by $3\mathrm{.}5\%$ annually. What is the current value of the stock at a discount rate of $15\%?($In dollars $$)$