Mary traders have invested in two securities traded at the Nairobi Stock Exchange (NSE). The security X Possible returns are estimated as 11%, 10%, 8%, 7%, 5%, 4%, 3%, 2%, 0% and 0%, for the periods one to ten. Those of Security Y are estimated as 15%, 13%, 12%, 11%, 9%, 6%, 5%, 4%, 3%, and 2%, for periods one to ten. Each possible return has an equal chance of being realized. Required If Goal traders portfolio formation is Ksh 50,000, committing equal amounts in each asset, determine the Portfolio risk