Sekeping uang logam dilemparkan sebanyak 8 kali. Tentukan peluang muncul angka paling banyak
Sekeping uang logam dilemparkan sebanyak 8 kali. Tentukan peluang muncul angka paling banyak:
a. 3 kali
b. 5 kali
Jawab:
a. n = 8, t = 3, dan p = ½
F(3) = P(X ≤ 3)
= f(0) + f(1) + f(2) + f(3)
= C(8, 0) . (½)0 . (½)8 + C(8, 1) . (½)1 . (½)7 + C(8, 2) . (½)2 . (½)6 + C(8, 3) . (½)3 . (½)5
= 1 . (½)8 + 8 . (½)8 + 28 . (½)8 + 56 . (½)8
= 0,0039 + 0,0313 + 0,1094 + 0,2188
F(3) = 0,3634
b. n = 8, t = 5, dan p = ½
F(5) = P(X ≤ 5)
= f(0) + f(1) + f(2) + f(3)
= C(8, 0) . (½)0 . (½)8 + C(8, 1) . (½)1 . (½)7 + C(8, 2) . (½)2 . (½)6 + C(8, 3) . (½)3 . (½)5 + C(8, 4) . (½)4. (½)4 + C(8, 5) . (½)5 . (½)3 +
= 1 . (½)8 + 8 . (½)8 + 28 . (½)8 + 56 . (½)8 + 70 . (½)8 + 56 . (½)8
= 0,0039 + 0,0313 + 0,1094 + 0,2188 + 0,2734 + 0,2188
F(5) = 0,8556
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