What is the expected return on the market portfolio, if the two securities described by the table below are correctly priced according to the CAPM?

Expected Return Beta

Security $14\mathrm{.}84\%0\mathrm{.}8$

Security $28\mathrm{.}70\%1\mathrm{.}2$

$($Express your answer as a fraction rounded to four decimal places. For example, if your answer is $6\mathrm{.}78\%,$ you should enter $0\mathrm{.}0678$ as your answer.$)$