$5-$ Calculate the variance and standard deviation using the correction for the

loss of a degree of freedom for General Motors stock price given the

following changes of its price during the last ten years

Variance $(tilde(r{)}_m)=\frac{1}{N-1}{\displaystyle \underset{t=1}{\overset{N}{}}}$tilde$(r{)}_{mt}-r_m$

Variance$(tilde(r{)}_m)=\frac{1}{N-1}{\displaystyle \underset{t=1}{\overset{N}{}}}$tilde$(r{)}_{mt}-r_m$