Real Challenge 4.4.2.
1. When two fair coins are tossed, what is the probability of getting exactly one head?
Answer:
2. When four fair coins are tossed, what is the probability of getting exactly two heads?
Answer:
Real Challenge 4.4.2.
2009-04-23 3:29 am
回答 (1)
2009-04-23 4:30 am
✔ 最佳答案
1. When two fair coins are tossed, what is the probability of getting exactly one head?sol
(h,h),(h,t),(t,h),(t,t)
==>2/4=1/2
Answer: 1/2
2. When four fair coins are tossed, what is the probability of getting exactly two heads?
sol
p(h=2)
=C(4,2)*(1/2)^4
=4!/(2!*2!)*(1/16)
=6/16
=3/8
Answer: 3/8
收錄日期: 2021-04-28 15:16:29
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https://hk.answers.yahoo.com/question/index?qid=20090422000051KK01323