I/O interfaces are necessary because ___________

An investor invested $360 in a T-bill with a return of 2% and $840 in a stock with an expected return of 8% and a standard deviation of 7%. a.  Calculate the expected return of this complete portfolio. [Do not type your answer in Canvas] [4 points]  b.  Calculate the risk of this complete portfolio. [Do not type your answer in Canvas] [2 points] c.  If the risk of this complete portfolio increases from 0 to 6%, calculate the expected return of this complete portfolio.  [Do not type your answer in Canvas] [4 points] 

OSI is a _________ layered communication model.

 What is the primary function of a firewall in a network?

According to Markowitz, discuss all the information or variables that are needed to calculate the risk of a portfolio.  Of the several variables, which variable is the most important variable?  Explain. [Do not type your answer in Canvas]

Which of the following is NOT a known I/O technique.

In the Generalized Bus Interface Configuration given below, identify 1 and 2. 

Which of the following is NOT a known way for a user or program to interact with Operating System. 

An investor bought a stock for $58, sold it 4 months later for $55, and received a dividend of $0.75. a.  Calculate the rate of return in %. [Do not type your answer in Canvas] [4 points] b.  Calculate the APR in %. [Do not type your answer in Canvas] [4 points] c.  Calculate the EAR in %. [Do not type your answer in Canvas] [4 points]

Which protocol is primarily used for sending emails?