1) When two fair coins are tossed, what is the probability of getting exactly one head?
2. When four fair coins are tossed, what is the probability of getting exactly two heads?
[明送分] Probability
2009-11-18 5:22 am
回答 (3)
2009-11-18 5:09 pm
✔ 最佳答案
1) When two fair coins are tossed, what is the probability of getting exactly one head?P(exactly 1 head)
= 2C1 X (1/2)^2
= 2 X (1/4)
= 1/2
2. When four fair coins are tossed, what is the probability of getting exactly two heads?
P(exactly 2 heads)
= 4C2 X (1/2)^4
= 6 X 1/16
= 3/8
2009-11-18 5:56 am
1) 1/2
2) 3/8
2) 3/8
2009-11-18 5:43 am
[明送分] Probability
1/2
1/4
收錄日期: 2021-04-19 20:39:28
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20091117000051KK01219