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The probability is 15/25 = 3/5

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It is 15/25 = 0.6

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Q: 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?
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What is the probability that A date picked at random is February 30?

The probability that a date picked at random is February 30th is zero, as there is no February 30th, even in leap years.


If a bag contains 20 chips labeled with the numbers 1 through 20 and one chip is selected at random. what is the probability that the chip has the number 17 on it?

The probability of selecting a 17 (or any number for that matter) is 1/20 or .05 or 5%.


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No, There exists a counter example in the page 244 of the book Grimmett & Stirzaker, One thousand exercises in probability. The example is a Bernoulli random variable with parameter 1/3.


A bag contains 6 purple marbles and 7 white marbles Two marbles are drawn at random One marble is drawn and not replaced Then a second marble is drawn What is the probability that the first marble?

There are 13 marbles in total. The order is specified.P(1st is white and the 2ndis purple) = (7/13)(6/12) = (7/13)(1/2) = 7/26.


Why binomial distribution can be approximated by Poisson distribution?

Only in certain circumstances:The probability of success, p, in each trial must be close to 0.Then, for the random variable, X = number of successes in n trials, the mean is npand the variance is np(1-p). But since p is close to 0, (1-p) is close to 1 and so np(1-p) is close to np.That is, the mean of the distribution is close to its variance. This is a characteristic of the Poisson distribution.Furthermore, the other characteristics of the distribution: constant probability, independence are met so the Binomial can be approximated by the Poisson.It is possible to prove this analytically but the limitations of this browser - especially in terms of mathematical notation - preclude that.Only in certain circumstances:The probability of success, p, in each trial must be close to 0.Then, for the random variable, X = number of successes in n trials, the mean is npand the variance is np(1-p). But since p is close to 0, (1-p) is close to 1 and so np(1-p) is close to np.That is, the mean of the distribution is close to its variance. This is a characteristic of the Poisson distribution.Furthermore, the other characteristics of the distribution: constant probability, independence are met so the Binomial can be approximated by the Poisson.It is possible to prove this analytically but the limitations of this browser - especially in terms of mathematical notation - preclude that.Only in certain circumstances:The probability of success, p, in each trial must be close to 0.Then, for the random variable, X = number of successes in n trials, the mean is npand the variance is np(1-p). But since p is close to 0, (1-p) is close to 1 and so np(1-p) is close to np.That is, the mean of the distribution is close to its variance. This is a characteristic of the Poisson distribution.Furthermore, the other characteristics of the distribution: constant probability, independence are met so the Binomial can be approximated by the Poisson.It is possible to prove this analytically but the limitations of this browser - especially in terms of mathematical notation - preclude that.Only in certain circumstances:The probability of success, p, in each trial must be close to 0.Then, for the random variable, X = number of successes in n trials, the mean is npand the variance is np(1-p). But since p is close to 0, (1-p) is close to 1 and so np(1-p) is close to np.That is, the mean of the distribution is close to its variance. This is a characteristic of the Poisson distribution.Furthermore, the other characteristics of the distribution: constant probability, independence are met so the Binomial can be approximated by the Poisson.It is possible to prove this analytically but the limitations of this browser - especially in terms of mathematical notation - preclude that.

Related questions

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


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


What is the probability for a student in a dormitory to be selected if 10 percent of the students live in dormitories and a random sample of 100 is selected?

The probability is 10 percent.


In a classroom the students are 11 boys and 1 girl if one student is selected at random find the probability that the student is a girl?

There is only one girl out of 12 students so the probability that the girl is selected is 1/12.


On a math test 5 out of 20 students got an A If three students are chosen at random what is the probability that all three got an A on the test?

P( a student getting an A) = 5/20=1/4 There are 3 students. The probability that all three got an A is (1/4)(1/4)(1/4)=1/64.


If a student is picked at random what is the probability that heshe received an A on hiher final?

If a student is picked at random what is the probability that he/she received an A on his/her fina?


In a classroom the students are 11 boys and 1 girls If one student is selected at random find the probability that the student is a girl?

1/12 =0.08333... ≈ 8.3%


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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


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The probability of a single point being chosen is 0.The probability of a single point being chosen is 0.The probability of a single point being chosen is 0.The probability of a single point being chosen is 0.


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


What is the probability that an f2 seed chosen at random will be yellow?

3/4