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Model Papers
In a class, having 60% boys, 5% of the boys and 10% of the girls have an I.Q. of more than 150. A student is selected at random and found to have an I.Q. of more than 150. Find the probability that the selected student is a boy.
cbse
class12
modelpaper
2012
sec-b
q22
math
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asked
Jan 4, 2013
by
thanvigandhi_1
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Related questions
In a class having 70% boys, 20% of the boys, and 10% of the girls are players. A student is selected at random from the class and found to be a player. Find the probability that the selected is a girl. Explain the contribution of sports in inculcating human values.
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Jan 21, 2013
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answers
In a class having 70% boys, 20% of the boys and 10% of the girls are players. A student is selected at random from the class and is found to be a player. Find the probability that the selected student is a girl.
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(i) In a group of student, selection of four students for cultural activity from 3 boys and 3 girls has to be done. Find the probability that either 3 boys and 1 girl or 3 girls and one boy are selected. (ii) Write the importance of co-curricular activities in inculcating human values.
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Jan 14, 2013
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A class consists of 50 students out of which there are 10 girls.In the class 2 girls and 5 boys are rank holders in an examination.If a student is selected at random from the class and is found to be a rank holder,what is the probability that the student selected is a girl?
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A box contains 2 gold and 3 silver coins. A box is choosen at random and a coin is drawn from it. If the selected coin is a gold coin, find the probability that it was drawn from the second box. A student should not carry ornaments and other precious things to school. why?
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12 cards, numbered 1 to 12, are placed in a box, mixed up throughly and then a card is drawn at random from the box. If it is known that the number on the drawn card is more than 3, find the probability that it is an even number.
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