Find `bar(u)` in the following cases :
(i) `sumf_(i)u_(i)=-5,sumf_(i)=50` (ii) `sumf_(i)u_(i)=21,sumf_(i)=36`

Find the mean (bar(X)) in the following cases : (i) sumf_(i)6,sumf_(i)x_(i)=21 (ii) sumf_(i)x_(i)=100,sumf_(i)=25

Find bar u in the following cases: sumf_iu_i=-5, sumf_i=50

Find bar u in the following cases: sumf_iu_i= -28, sumf_i=100

Find bar u in the following cases: sumf_iu_i= 21, sumf_i= 36

Find bar u in the following cases: sumf_iu_i= 66, sumf_i=100

Find bar d in the following cases: sumf_id_i=80 , sumf_i=50 .

Find bar d in the following cases: sumf_id_i=18, sumf_i=15

Find the mean barX in the following cases: sumf_ix_i=75 and sumf_i=15

Find bard in the following cases: sumf_id_i=108 , sumf_i=100 .

Find bar d in the following cases: sumf_id_i=140, sumf_i=80 .