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In a meeting, 70% of the members favour a certain proposal, 30% being opposite. A member is selected at random and we take X = 0, if he opposed, and x = 1, if he is in favour. Find E(X) and variance (X).
cbse
class12
modelpaper
2012
sec-b
q21
math
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asked
Jan 31, 2013
by
thanvigandhi_1
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0
votes
1
answer
In a meeting, 70% of the members favour and 30% oppose a certain proposal. A member is selected at random and we take X = 0, if he opposed, and X = 1, if he is in favour. Find E(X) and Var (X).
asked
Nov 27, 2012
by
balaji.thirumalai
cbse
class12
bookproblem
ch13
sec4
p571
q15
sec-b
medium
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0
votes
1
answer
Assume that the chances of a patient having a heart attack is 40%. It is assumed that a meditation and yoga course reduce the risk of heart attack by 30% and prescription of certain drug reduces its chance by 25%. At a time, a patient can choose any one of the two options with equal probabilities. It is given that after going through one of the two options the patient selected at random suffers a heart attack. Find the probability that the patient followed a course of meditation and yoga?
asked
Jan 27, 2013
by
thanvigandhi_1
cbse
class12
modelpaper
2012
sec-c
q29
math
0
votes
0
answers
Assume that the chance of a patient having a heart attack 40%. It is also assumed that a meditation and yoga course reduces the risk of heart attack by 30% and prescription of a certain drug reduces its chance by 25%. At a time a patient can choose any one of the two option with equal probabilities. It is given that after going through one of the two options the patient selected at random suffers a heart attack. Find the probability that the patient followed a course of meditation and yoga.
asked
Dec 29, 2012
by
thanvigandhi_1
cbse
class12
modelpaper
2012
sec-c
q29
math
0
votes
1
answer
Bag I contains 3 black and 2 white balls. Bag II contains 2 black and 4 white balls. A bag and a ball is selected at random. Determine the probability of selecting a black ball.
asked
Feb 7, 2013
by
thanvigandhi_1
cbse
class12
modelpaper
2012
sec-b
q21
medium
math
0
votes
1
answer
Assume that the chances of a patient having a heart attack is 40%. It is also assumed that a meditation and yoga course reduce the risk of heart attack by 30% and prescription of certain drug reduces its chances by 25%. At a time a patient can choose any one of the two options with equal probabilities. It is given that after going through one of the two options the patient selected at random suffers a heart attack. Find the probability that the patient followed a course of meditation and yoga?
asked
Nov 27, 2012
by
balaji.thirumalai
cbse
class12
bookproblem
ch13
misc
p584
q13
sec-c
medium
modelpaper
2012
q26
math
0
votes
0
answers
A company has two plants to manufacture motor cycled. 70% motor cycles are manufactured at the first plant, while 30% are manufactured at the second plant. At the first plant, 80% motor cycles are rated of the standard quality while at the second plant, 90% are rated of standard quality. A motor cycle, randomly picked up, is found to be of standard quality. Find the probability that it has come out from the second plant.
asked
Jan 24, 2013
by
fingeazy
cbse
class12
modelpaper
2005
sec-c
q21
math
0
votes
0
answers
A company has two plants to manufacture bicycles. Plant I manufactures 70% of the bicycles and plant II manufactures 30%. At plant I 80% of the bicycles are rated as of standard quality and a plant II 90% of the bicycles are rated as of standard quality. A bicycle is choosen at random and is found to be of standard quality. What is the probability that it has come from plant II?
asked
Feb 2, 2013
by
thanvigandhi_1
cbse
class12
modelpaper
2012
sec-c
q29
math
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