Suppose that David Samuel wants to invest in three company shares: APPL, FB, and IBM. He decides to do some market research before he invests his money in these shares. The following table provides information about the share units per transaction for each company share. David would like to consider the trading volume of investment to be at least 1,500 share units per transaction. Trading volume, or volume, is the number of shares or contracts that indicates the overall activity of a security or market for a given period.