1. While FF was started 40 years ago, its common stock has been publicly traded for the past 25 years. 2. The returns on its equity are calculated as arithmetic returns. 3. The historical returns for FF for 2012 to 2016 are:

hello some details/parts of your question are missing attached below is the missing part

answer : A ) = 24.13%

              B ) =  0.1084, The preceding data series represents a SAMPLE        

              C ) =  0.4494

Explanation:

A) The average realized  return on FF stock can be calculated as

= 24% + 16.15% + 29% +39.9% + 12.35% / 5

= 24.13%

B) The preceding data series represents a SAMPLE  standard deviation BECAUSE RETURNS WERE MADE ONLY FOR FIVE YEARS

and the sample standard deviation is calculated as

 =   0.01175056

s = = 0.1084

C) coefficient of variation

coefficient of variation = standard deviation / mean

                                      = 0.1084 / 0.2413 = 0.4494