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lulus= 1-0,25=0,75
siswa yg mengikuti ujian 1/0,75 atau 4/3 x 222
= 296
P(A) = 1-P(A^c) = 1-0,25 = 0,75
fh(A) = byk siswa x P(A)
222 = byk siswa x 0,75
byk siswa = 222:0,75 = 296 siswa