Dua dadu dilambungkan bersama-sama sebanyak 4 kali. Tentukan peluang terlihat pasangan mata dadu
Dua dadu dilambungkan bersama-sama sebanyak 4 kali. Tentukan peluang terlihat pasangan mata dadu berjumlah 9 paling banyak:
a. 1 kali
b. 2 kali
c. 3 kali
Jawab:
a. n = 4, t = 1, dan p = 4/36 = 1/9
F(1) = P (X ≤ 1)
= f(0) + f(1)
= C(4, 0) . (1/9)0 (8/9)4 + C(4, 1) . (1/9)1 (8/9)3
= 1 . 1 . (8/9)4 + 4 . 1/9 . (8/9)3
= 0,6243 + 0,3121
F(1) = 0,9364
b. n = 4, t = 2, dan p = 4/36 = 1/9
F(2) = P (X ≤ 2)
= f(0) + f(1) + f(2)
= C(4, 0) . (1/9)0 (8/9)4 + C(4, 1) . (1/9)1 (8/9)3 + C(4, 2) . (1/9)2 (8/9)2
= 1 . 1 . (8/9)4 + 4 . 1/9 . (8/9)3 + 6 . (1/9)2 (8/9)2
= 0,6243 + 0,3121 + 0,0585
F(2) = 0,9949
c. n = 4, t = 3, dan p = 4/36 = 1/9
F(3) = P (X ≤ 3)
= f(0) + f(1) + f(2) + f(3)
= C(4, 0) . (1/9)0 (8/9)4 + C(4, 1) . (1/9)1 (8/9)3 + C(4, 2) . (1/9)2 (8/9)2 + C(4, 3) . (1/9)3 (8/9)1
= 1 . 1 . (8/9)4 + 4 . 1/9 . (8/9)3 + 6 . (1/9)2 (8/9)2 + 4 (1/9)3 (8/9)
= 0,6243 + 0,3121 + 0,0585 + 0,0049
F(3) = 0,9998
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