Dua dadu ditos bersama 180 kali. Frekuensi harapan muncul mata dadu berjumlah 8 adalah

Kelas 9 Matematika
Bab Peluang

Muncul mata dadu berjumlah 8 = { (2,6), (6,2), (3,5), (5,3), (4,4) }
n = 5

Jumlah titik sampel 2 dadu
= 6²
= 35

Frekuensi harapan
= 5/36 . 180
= 25 kali

n = 180

A = {(2, 6), (3, 5), (4, 4), (5, 3), (6, 2)}

n(A) = 5

S = {(1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (1, 6), (2, 1), (2, 2), (2, 3), (2, 4), (2, 5), (2, 6), (3, 1), (3, 2), (3, 3), (3, 4), (3, 5), (3, 6), (4, 1), (4, 2), (4, 3), (4, 4), (4, 5), (4, 6), (5, 1), (5, 2), (5, 3), (5, 4), (5, 5), (5, 6), (6, 1), (6, 2), (6, 3), (6, 4), (6, 5), (6, 6)}

n(S) = 36

Fh(A) = n × P(A)
= n × n(A)/n(S)
= 180 × 5/36
= 25