You have a friend, who want to put money in an investment product for a few years. They want to ask advice from you about what is the historical performance of the investment product. So decide to show them the arithmetic average return and geometric average return in addition to the products' volatility. The past four year performance of the product is 12%, 16%, -2%, and 5%. Using the past four year's performance to find the two average return and the product's volatility.