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Verified answer
Misal nilai ke 5 = a82 = ( 85 + 65 + 90 + 75 + a ) / 5
82 × 5 = 315 + a
410 = 315 + a
a = 410 - 315
a = 95
jadi nilai Astuti yg ke 5 harus 95
X = 410 - 315
X = 95