yg nomor satu,, rumusnya aja dech,, klo bisa sh dg cara,, please...!

x(24) = 5,8
x(25) = 5,87 (Karena digabung)
n(24) = 24
n(1) = 1
n(25) = 25

x(25) = (x(24).n(24) + x(1)n(1)) / n(25)
5,87 = (5,8 x 24 + x(1) x 1) / 25
146,75 = 139,2 + x(1)
x(1) = 146,75 - 139,2
x(1) = 7,55