Mathematics Part-II

Book: Mathematics Part-II

Chapter: 13. Probability

Subject: Maths - Class 12th

Q. No. 15 of Exercise 13.5

Listen NCERT Audio Books - Kitabein Ab Bolengi


The probability that a student is not a swimmer is 1/5. Then the probability that out of five students, four are swimmers is

In this question, let us assume X represent the number of students out of 5 who are swimmers

Also, the repeated selection of students who are swimmers are the Bernoulli trials

Thus, probability of students who are not swimmers

Clearly, we have X has the binomial distribution where n = 5


Hence, probability that four students are swimmers = P (X = 4)

option A is correct


Chapter Exercises

More Exercise Questions