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A class has 30 students what is the probability that nobody in the class have same birthday count one year as 365 days?
Wiki User
∙ 16y ago
ok let's try this!
on any given date, probability that there is a student with a birthday is 30/365, so prob. that two students have that birthday is (30/365)^2. Tell me if I'm wrong, somebody!
So the problem that this does NOT happen is 1-(30/365)^2 which is 0.9932445...
I'm not sure about this next bit:
there are 365 days in which this probably won't occur, does that make a difference?
Wiki User
∙ 16y ago
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What is the probability that at least 2 students in a class of 36 have the same birthday?
About 83.2%The probability that non of the 36 students have the same birthday (not consideringFebruary 28 of the leap year) is given by the following relation:P(non out of n have same bd) = Π1n-1 [(365-i)/365]P(non out of 36 have same bd) = (364/365)(363/365)(362/365) ... (331/365)(330/365) == 0.167817892.. ≈ 16.8%So the probability of at least 2 having the same birthday is about 1 - .168 = 0.832 =83.2%
The probability that a given student will show up for the test is 0.9 if there are 27 students in the class what is the probability that everyone will show up?
.9^27, or approximately .058 = 5.8%
Two students are chosen at random from a class of 30 what is the probability that both you and your best friend are chosen?
The probability of this is based heavily on whether or not said best friend is even in the class. If both are in, it's a 1/870 chance.Ê
If there are 45 students in a biology class and 23 are girls what is the probability that a student chosen at random will be a boy?
Probability that a girl is chosen = 23/45 = .511 So, the probability that a boy is chosen = 1 - .511 = .489
In a third grade class containing 13 girls and 7 boys Two students are randomly selected to give out homework What is the probability that both students are girls?
13 out of 20
If two students are chosen randomly at the same class what is probability to have the same birthday is it likely or unlikely?
It depends on how big the class is.
What is a birthday attack?
A birthday attack is a method of code decryption which exploits the birthday paradox - that which explains that within a class of 30 students, there is an assumed probability of two sharing the same birthday of 70 percent.
What is the probability that at least 2 students in a class of 36 have the same birthday?
About 83.2%The probability that non of the 36 students have the same birthday (not consideringFebruary 28 of the leap year) is given by the following relation:P(non out of n have same bd) = Π1n-1 [(365-i)/365]P(non out of 36 have same bd) = (364/365)(363/365)(362/365) ... (331/365)(330/365) == 0.167817892.. ≈ 16.8%So the probability of at least 2 having the same birthday is about 1 - .168 = 0.832 =83.2%
What if a class of 25 students has 15 girls and boys if one student is chosen at random what is the probability it is a girl?
The probability is 15/25 = 3/5
There are 10 boys and 12 girls in a class if one student is selected at random from the class what is the probability it is a girl?
The probability is the number of girls divided by the number of students, so 12/22, or 6/11
The probability that a given student will show up for the test is 0.9 if there are 27 students in the class what is the probability that everyone will show up?
.9^27, or approximately .058 = 5.8%
Two students are chosen at random from a class of 30 what is the probability that both you and your best friend are chosen?
The probability of this is based heavily on whether or not said best friend is even in the class. If both are in, it's a 1/870 chance.Ê
If there are 45 students in a biology class and 23 are girls what is the probability that a student chosen at random will be a boy?
Probability that a girl is chosen = 23/45 = .511 So, the probability that a boy is chosen = 1 - .511 = .489
There are 100 students distributed into 4 classrooms. There are 54 girls and 46 boys. What is the probability that a class will have 15 girls?
I am not going to help you cheat in math class!!!!!!!!!!!!!
A class of 25 students has 15 girls and 10 boys If one student is chosen at random What is the probability it is a girl?
The probability is 15/25 = 3/5
In a third grade class containing 13 girls and 7 boys Two students are randomly selected to give out homework What is the probability that both students are girls?
13 out of 20
A nursing class has 13 women and 18 men If a student is chosen randomly to be the team leader what is the probability the student is a woman?
The probability that a randomly chosen student is a woman can be calculated by dividing the number of women by the total number of students in the class. In this case, there are 13 women and 31 total students, so the probability is 13/31, which simplifies to approximately 0.419 or 41.9%.
