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Jumlah ulangan = 5
a. Rata rata = 380/5 = 76
b .( 380 + x) : 6 = 77
380 + x = 462
x = 462 -380
X = 82
Bila ingin Nilai ulangan 77 maka nilai terakhir 82
= 380/5
= 76
b. (77x6)-(76x5) = 462-380
= 82