problem 6

 need 2 answers

Problem Set #6(Please add references)

Please, address each of the questions below, in 100-150 words (per question). Include any relevant examples and links to your sources.  

1. 1.  What is the relationship between investment risk and investment return?

2. 2.  Define and explain the concept of standard deviation.

3. 3.  Define and explain the concept of normal distribution.