7.3.4 Statistik, SPM Praktis (Kertas 1)


Soalan 7:
Satu set data mengandungi dua belas nombor positif.
Diberi bahawa Σ ( x x ¯ ) 2 =600 dan Σ x 2 =1032.
Cari
(a) varians
(b) min

Penyelesaian:
(a)
Varians= Σ ( x x ¯ ) 2 N             = 600 12             =50

(b)
Varians= Σ x 2 N ( x ¯ ) 2         50= 1032 12 ( x ¯ ) 2      ( x ¯ ) 2 =8650             =36            x ¯ =36

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