Year	Return on security A
2017	10%
2018	12%
2019	14%

average return of security a is 12%

standard deviation of return for security A is 2%

Assume that security B has an average return of 16% and a standard deviation of return of 3.3%, and that correlation between security A and security B is -1. Calculate the average return and standard deviation of return for a portfolio 50% invested in security A and 50% invested in security B. Comment on the result.

(22 marks)