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Model Papers
In a school, 15 N.S.S. volunteer selected for cultural activities of which 3 are extras 3 volunteers are selected at random out of them. Let X denote the number of volunteer as extras. Find the probability distribution of X.
cbse
class12
modelpaper
2012
sec-b
q22
math
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asked
Jan 22, 2013
by
thanvigandhi_1
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Related questions
(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.
cbse
class12
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2012
sec-b
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Jan 14, 2013
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In a village of 50 people, 20 people have their fast on 2nd october. Two persons are selected at random out of them. Write the probability distribution for selected persond who are on fast. Also, find the mean of the distribution.
cbse
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2012
sec-b
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Jan 28, 2013
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thanvigandhi_1
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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.
cbse
class12
modelpaper
2012
sec-b
q22
math
asked
Feb 2, 2013
by
thanvigandhi_1
0
answers
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?
cbse
class12
modelpaper
2012
sec-b
q22
math
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Jan 16, 2013
by
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There are 40 workers in a factory who are participating in strike for increase in wages. Out of them 5 workers are sincere to management and believe that management know each thing and do the needful. Management selects 2 workers at random out of them. Write the probability distribution for the selected worker who are sincere. Also find the mean of the distribution.
cbse
class12
modelpaper
2012
sec-c
q29
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asked
Jan 28, 2013
by
thanvigandhi_1
0
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Let X denote the number of hours you study during a randomly selected school day. The probability that X can take the values X has the following form, where k is some unknown constant. \[ p(X=x) = \left\{ \begin{array}{l l}0.1, & \quad if{ x = 0}\\ kx, & \quad if{ x = 1 \: or\: 2} \\ k(5-x), & \quad if{ x = 3 \: or\: 5} \\ 0, & \quad \: otherwise \end{array}. \right. \] (i) Find the value of K (ii) What is the probability that you study atleast two hours? Exactly two hours? Atmost two hours?
cbse
class12
modelpaper
2012
sec-c
q29
math
asked
Jan 30, 2013
by
thanvigandhi_1
0
answers
Two bags A and B contain 2 white, 4 red and 3 white, 3 red balls respectively. One of the bags is selected at random and a ball is drawn from it. If the selected ball is of white colour, find the probability that it is drawn from bag A.
cbse
class12
modelpaper
2012
sec-b
q22
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Jan 11, 2013
by
thanvigandhi_1
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