What is the beta of a portfolio comprised of the following securities$?$

Stock Amount Invested

Security

Beta

A $$6,300$

$1\mathrm{.}70$

B $$5,3001\mathrm{.}81$

Market $$8,800$

$1\mathrm{.}755$

$1\mathrm{.}427$

$1\mathrm{.}432$

$0\mathrm{.}995$

$1\mathrm{.}70$

$1\mathrm{.}503$