1 class has at least?? peoples for probability has at least 2 people with the same birthday>0,5?

2 ⤊

1 class has at least?? peoples for probability has at least 2 people with the same birthday>0,5?

a.>=21 b>22 c.>=23 d.>24 (1 year has 365 days)

2006-07-21 17:09:40 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

3 answers

C) >= 23

2006-07-21 17:13:34 · answer #1 · answered by MsMath 7 · 2⤊ 0⤋

the answer is c.
with 23 people the probability is 50.729723432 %
or 1 - (365/365)(364/365)(363/365) ... (343/365) > .5
(with 22 people its only 47.5695307..%

2006-07-22 00:17:16 · answer #2 · answered by Scott R 6 · 0⤊ 0⤋

http://mathforum.org/dr.math/faq/faq.birthdayprob.html

2006-07-22 00:20:14 · answer #3 · answered by gjmb1960 7 · 0⤊ 0⤋