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Recent questions tagged p571
ASK
Suppose that two cards are drawn at random from a deck of cards. Let X be the number of aces obtained. Then the value of E(X) is ?
cbse
class12
bookproblem
ch13
sec4
p571
q17
sec-a
medium
math
asked
Nov 27, 2012
by
balaji.thirumalai
1
answer
The mean of the numbers obtained on throwing a die having written 1 on three faces, 2 on two faces and 5 on one face is
cbse
class12
bookproblem
ch13
sec4
p571
q16
sec-a
easy
math
asked
Nov 27, 2012
by
balaji.thirumalai
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).
cbse
class12
bookproblem
ch13
sec4
p571
q15
sec-b
medium
math
asked
Nov 27, 2012
by
balaji.thirumalai
1
answer
A class has 15 students whose ages are 14, 17, 15, 14, 21, 17, 19, 20, 16, 18, 20, 17, 16, 19 and 20 years. One student is selected in such a manner that each has the same chance of being chosen and the age X of the selected student is recorded. What is the probability distribution of the random variable X? Find mean, variance and standard deviation of X.
cbse
class12
bookproblem
ch13
sec4
p571
q14
sec-b
medium
math
asked
Nov 27, 2012
by
balaji.thirumalai
1
answer
Let X denote the sum of the numbers obtained when two fair dice are rolled. Find the variance and standard deviation of X.
cbse
class12
bookproblem
ch13
sec4
p571
q13
sec-b
medium
math
asked
Nov 27, 2012
by
balaji.thirumalai
1
answer
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 E(X).
cbse
class12
bookproblem
ch13
sec4
p571
q12
sec-b
easy
math
asked
Nov 27, 2012
by
balaji.thirumalai
1
answer
Two dice are thrown simultaneously. If X denotes the number of sixes, find the expectation of X.
cbse
class12
bookproblem
ch13
sec4
p571
q11
sec-b
easy
math
asked
Nov 27, 2012
by
balaji.thirumalai
1
answer
Find the mean number of heads in three tosses of a fair coin.
cbse
class12
bookproblem
ch13
sec4
p571
q10
easy
sec-b
math
asked
Nov 27, 2012
by
balaji.thirumalai
1
answer
The random variable X has a probability distribution P(X) of the following form, where k is some number : \[ P(X) = \left\{ \begin{array}{l l} k & \quad \text{if $x$ = 0}\\ 2k & \quad \text{if $x$ = 1} \\ 3k & \quad \text{if $x$ = 2} \\ 0 & \quad \text{otherwise} \end{array} \right. \] (a) Determine the value of k. (b) Find \(P (X \lt 2), P (X \leq 2), P(X \geq 2).\)
cbse
class12
bookproblem
ch13
sec4
p571
q9
sec-b
easy
math
asked
Nov 27, 2012
by
balaji.thirumalai
1
answer
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