Siti Khadijah currently has a portfolio of shares giving an expected return of $18\%$ with a standard deviation of $10\%.$ She is considering investing in one of the following additional investments.

Hujan Panas

Berhad$$s stock

Hujan Renyai

Berhad$$s stock

Expected return $8\%8\%$

Standard deviation $5\%3\%$

Coefficient of correlation with existing portfolio $-0\mathrm{.}7+0\mathrm{.}4$

The new investment will comprise $20\%$ of her enlarged portfolio. Clearly compute the expected rate of return, standard deviation, and coefficient variation. Based on the computation which of the two investments should Siti Khadijah $?$choose$19$:$13$