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Let a pair of dice be thrown and the random variable X be the sum of the numbers that appear on the two dice. Find the mean or expectation of X.
cbse
class12
modelpaper
2012
sec-c
q36
math
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Dec 21, 2012
by
balaji.thirumalai
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Two dice are thrown simultaneously. Let X denotes the number of sixes. Find the probability distribution of X. Also find the mean, variance and standard deviation of X using probability distribution table.
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Feb 6, 2013
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Two numbers are selected at random ( without replacement ) from the first six positive integers. Let X denote the larger of the two numbers obtained. Find the probability distribution of the random variable X, and hence find the mean of the distribution.
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Mar 25, 2014
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A doctor is to visit a patient. From the past experience, it is known that the probabilities that he will come by train, bus, scooter or by any other means of transport are respectively \(\frac{3}{10}, \frac{1}{5}, \frac{1}{10} \) and \( \frac{2}{5} \) . The probabilities that he will be late are \( \frac{1}{4}, \frac{1}{3} \) and \( \frac{1}{12} \) if he comes by train, bus and scooter respectively, but if he comes by other means of transport, then he will not be late. When he arrives, he is late. What is the probability that he comes by train.
asked
Dec 21, 2012
by
thanvigandhi_1
cbse
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modelpaper
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(i) In the village of 50 people 25 people have their fast on republic day. Two persons are selected at random out of them, write the probability distribution who are on fast. Also find the mean of the distribution. (ii) What do you mean by republic?
asked
Jan 13, 2013
by
thanvigandhi_1
cbse
class12
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A pair of dice is thrown 4 times. If getting a doublet is considered a success, find the probability distribution of number of successes.
asked
Feb 11, 2013
by
thanvigandhi_1
cbse
class12
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2012
sec-b
q22
difficult
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0
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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.
asked
Jan 28, 2013
by
thanvigandhi_1
cbse
class12
modelpaper
2012
sec-c
q29
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0
votes
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?
asked
Jan 30, 2013
by
thanvigandhi_1
cbse
class12
modelpaper
2012
sec-c
q29
math
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