statistics

posted by .

A sixth form class consists of 6 girls and 9 boys. Three students from the class are chosen at random. The number of boys chosen is denoted by the random variable X. Show that
a)P(X=0)=120/2730
b)P(X=2)=1296/2730

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Math 132

    There are 7 girls and 6 boys in a class. Suppose five children are randomly chosen to decorate the game room. Given that at least one boy is chosen, what is the probability that exactly two boys are chosen?
  2. Math

    a class has 10 boys and 5 girls; three students are selected from the class at random one after other. the probability that the first two boys and the third is a girl?
  3. math

    A student is chosen at random from a class of 10 boys and 20 girls. What are the odds that a girl is not chosen?
  4. statistics

    A class has 100 students, 70 of which are boys. 70% of the boys are involved in sports, while 40% of the girls are involved in sports. A student is chosen at random. If the student chosen is a boy, what is the probability that he is …
  5. math

    2 students are chosen at random from a group of 120 students that has 60 boys and 60 girls. What is the probability that the students are either both boys or both girls
  6. STATISTICS

    a team of 3 is to be chosen from 4 boys and 5 girls. if X is the random variable of the number of girls in the team find the Expected variable X. E(X)
  7. Math 1350

    Mrs. Smith's classroom can hold at the most 30 students. Her first period class had 4 boys for every 3 girls. When 3 boys and 1 girl were added to the class, the new ratio became 3 boys to 2 girls. How many total students are now in …
  8. mathematics

    a class contains 15 boys and 21 girls.a student is chosen at random.what is the probability that a boy is chosen?
  9. maths

    In a graduating class with the same number of boys and girls, 1/8 of the girls and 5/6 of the boys are honor students. What part of the class consists of boys who are not honor students
  10. Statistics

    Survey of 115 families chosen at random, having 5 children it was observed that the distribution was as follows The 5 children are girls is 6 There is one boy and four girls is 18 There are two boys and three girls is 35 There are …

More Similar Questions