e(ti)= 1×P(ti = 1)+0×P(ti = 0)= 1×pi+0×( 1-pi)= pi
So e (t 1) = p 1
D(ti)=( 1-E(ti))? ×P(ti= 1)+(0-E(ti))? ×P(ti=0)
=( 1-pi)? pi+pi? ( 1-pi)= pi( 1-pi)=( 1/4)-( 1/2)-pi)?
Because 0
Then d (T2) = (1/4)-(1/2)-p2)? & gt( 1/4)-( 1/2)-p 1)? =D(t 1)