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Recent questions tagged exercise10-2
ASK
Find the mean and variance for the following probability density functions $f(x) = \left\{ \begin{array}{l l} xe^{-x}, & \quad \text{if $x$$>$0}\\ 0, & \quad \text{otherwise} \end{array} \right.$
tnstate
class12
bookproblem
ch10
sec-1
exercise10-2
p211
q7
q7-3
modelpaper
mar-2006
oct-2007
mar-2008
asked
Apr 20, 2013
by
poojasapani_1
1
answer
Find the mean and variance for the following probability density functions $f(x) = \left\{ \begin{array}{l l} \alpha e^{-\alpha x} ,& \quad \text{if $x$$>$$0$}\\ 0 ,& \quad \text{otherwise} \end{array} \right.$
tnstate
class12
bookproblem
ch10
sec-1
exercise10-2
p211
q7
q7-2
modelpaper
oct-2009
asked
Apr 20, 2013
by
poojasapani_1
1
answer
Find the mean and variance for the following probability density functions $f(x) = \left\{ \begin{array}{l l} \frac {1}{24} ,& \quad \text{-12$\leq$$ x$$\leq $$12$}\\ 0, & \quad \text{otherwise} \end{array} \right.$
tnstate
class12
bookproblem
ch10
sec-1
exercise10-2
p211
q7
q7-1
modelpaper
oct-2006
asked
Apr 20, 2013
by
poojasapani_1
1
answer
The probability distribution of a random variable $x$ is given below: \[\] $\begin{array} {llllllll} \textbf{X:}& 0& 1& 2& 3 \\ \textbf{P(X=x):}& 0.1& 0.3 &0.5& 0.1& \end{array}$\[\] If $Y=X^{2}+2X$ find the mean and variance of $Y$.
tnstate
class12
bookproblem
c10
sec-1
exercise10-2
p211
q6
modelpaper
jun-2008
asked
Apr 20, 2013
by
poojasapani_1
1
answer
In a gambling game a man wins Rs.$10 $ if he gets all heads or all tails and loses Rs.$5$ if he gets $1$ or $2$ heads when $3$ coins are tossed once. Find his expectation of gain.
tnstate
class12
bookproblem
ch10
sec-1
exercise10-2
p211
q5
asked
Apr 20, 2013
by
poojasapani_1
1
answer
Two cards are drawn with replacement from a well shuffled deck of $52$ cards. Find the mean and variance for the number of aces.
tnstate
class12
bookproblem
ch10
sec-1
exercise10-2
p211
q4
asked
Apr 20, 2013
by
poojasapani_1
1
answer
In an entrance examination a student has to answer all the $120$ questions. Each question has four options and only one option is correct. A student gets $1$ mark for a correct answer and loses half mark for a wrong answer. What is the expectation of the mark scored by a student if he chooses the answer to each question at random?
tnstate
class12
bookproblem
ch10
sec-1
exercise10-2
p211
q3
modelpaper
jun-2007
asked
Apr 20, 2013
by
poojasapani_1
1
answer
Find the expected value of the number on a die when thrown.
tnstate
class12
bookproblem
ch10
sec-1
exercise10-2
p211
q2
asked
Apr 20, 2013
by
poojasapani_1
1
answer
A die is tossed twice. A success is getting as odd number on a toss. Find the mean and the variance of the probability distribution of the number of successes.
tnstate
class12
bookproblem
ch10
sec-1
exercise10-2
p211
q1
asked
Apr 20, 2013
by
poojasapani_1
1
answer
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