In Problem 3, how many securities need to be held before the risk of a portfolio is

Question:

In Problem 3, how many securities need to be held before the risk of a is only 10% more than minimum? Portfolio
A portfolio is a grouping of financial assets such as stocks, bonds, commodities, currencies and cash equivalents, as well as their fund counterparts, including mutual, exchange-traded and closed funds. A portfolio can also consist of non-publicly...