# Soal Peluang Statistik

• Pencipta
Topik Pertanyaan
• #4405
Ika

Seventy five percent of youths ages 12-17 have a systolic blood pressure lower than 136mm of mercury. What is the probability that a sample of 12 youths of that age group will include:

a. exactly 4 who have a blood pressure greater than 136

b. no more than 4 who have a blood pressure greater than 136

c. at least 4 who have a blood pressure greater than 136.

Jawaban :

Melihat 1 balasan (dari total 1)
• Penulis
Jawaban
• #4406
R-Stats
Keymaster

Diketahui $$1-p=0\text{,}75$$ atau $$p=0\text{,}25$$ dan $$n=12.$$ Selesaikan soal-soal tersebut menggunakan distribusi binomial $P(X=x)=\binom {n}{x}p^x {(1-p)}^{n-x}$

a. $$P(X=4)= \binom {12}{4}(0\text{,}25)^4 {(1-0\text{,}25)}^{12-4}$$

b. $$P(X<4)=P(X=0)+P(X=1)+P(X=2)+P(X=3)$$

c. $$P(X \geq 4)=1-P(X<4)$$

Melihat 1 balasan (dari total 1)
• Anda harus log masuk untuk menambahkan jawaban.