A class consists of 25 students of which 10 are girls are 15 are boys; 4 girls and 6 boys were put in first class in an examination. If a student is selected at random from the class and is found to...

Extracted text: A class consists of 25 students of which 10 are girls are 15 are boys; 4 girls and 6 boys were put in first class in an examination. If a student is selected at random from the class and is found to have first class, what is the probability that the student selected is a girl. How is this probability affected if the distribution of boys and girls in the whole class is unknown?