Q$1.$ As a broker, you are approached by a client who wants to invest money in energy or oil & gas stocks. The only information you have available to advise your client is the stock price indexes for energy only is in natural logarithm inserted on the following table:

$\backslash$table$[[,$Stock Price Index,,,Return,Daily Volatility$],[$Date$,$ENERGY,OIL&GAS,,,Energy,OIL&GAS,ENERGY,&GAS$],[$Monday$,19\mathrm{.}62,105\mathrm{.}20,,,,,,],[$Tuesday$,19\mathrm{.}69,115\mathrm{.}80,,,,,,],[$Wednesday$,19\mathrm{.}75,116\mathrm{.}28,,,,,,],[$Thursday$,20\mathrm{.}35,115\mathrm{.}92,,,,,,],[$Friday$,20\mathrm{.}05,125\mathrm{.}02,,,,,,],[$Monday$,19\mathrm{.}98,135\mathrm{.}20,,,,,,],[,,,,,,,,],[$Average$,,,,,,,,],[$stdev$,,,,,,,,],[$correlation$,0\mathrm{.}91,,,,,,,],[$covariance$,0\mathrm{.}65,,,,,,,]]$

Your client is particularly interested in:

a$)$ The daily return for each stock

b$)$ The average daily return

c$)$ The relative risk associated to each stock

d$)$ The daily volatility of each stock

e$)$ The average daily volatility

f$)$ In which stock should investment money be invested?