What is the probability that a student chosen at random out of 3 girls and 4 boys is a boy?

Two thirds of the students in a class are boys and the rest girls.It is known that the probability of a girl getting a first class is 0.25 and that of a boy getting a first class is 0.28 find the probability that a student chosen at random will get first class marks in the subject.

A class consist of 30 boys and 20 girls of which half the girls have blue eyes.Find the probability that a certain student chosen at random is a boy or has blue eyes.

In a school there are 1000 students,out of which 430 are girls.It is known that out of 430,10% of the girls study in class XII.What is the probability that a student chosen randomly studies in class XII given that the chosen student is a girl?

In a school there are 1000 students,out of which 430 are girls.It is known that out of 430,10% of the girls study in class XII.What is the probability that a student chosen randomly studies in Class XII given that the chosen student is a girl?

In a school,there are 1,000 students,out of which 380 are girls.Out of 380 girls,10% of the girls scored highest in GS. What is the probability that a student chosen randomly scored highest in GS given that the chosen student is a girl?What value do you observe in it?

If there are 50 students in a class out of which 35 are boys.if only 60% of students passes in an exmination then find the probability that a student selected at random will be a girl who has passed the exam.

5 girls and 10 boys sit at random in a row having 15 chairs numbered as 1 to 15. Find the probability that end seats are occupied by the girls and between only two girls odd number of boys sit.

There are 35 students in a class of whom 20 are boys and 15 are girls. From these students one is chosen at random. What is the probability that the chosen student is a (i) boy, (ii) girl?

Three groups of children contain respectively 3 girls and 1 boy, 2 girls and 2 boys and 1 girl and 3 boys. One child is selected at random from each group. The probability that the three selected consists of 1 girl and 2 boys is