A die is thrown 100 times .If getting an odd number is considered a success,the variance of the number of success is
50
25
10
100
A random variable x has the following distribution ,p(x<3)is
3/5
3/10
1/10
5/12
Two cards are drawn at random from a pack of 52 cards.The probability of these being queen is
1/26
1/2
1/221
None of these
If the standard deviation of a binomial distribution (q+p) 16 is 2,then its mean is
2
4
8
16
An urn contains 6 white and 4 black balls.A fair die is rolled and that number of balls are chosen from the urn.The probability that the balls selected are white is
1/5
1/6
1/7
1/8
In a Binomial distribution ,the probability of getting a success is 1/4 and standard deviation is 3 .Then its mean is
6
12
A random variable X has following distribution .The variance of X is.
1
An ordinary cube has four blank faces.One face marked 2 and another marked 3.Then the probability of obtaining 12 in 5 throws is
One of the two events must occur.If the chance of one is 2/3 of the other,then odds in favour of the other are
1:3
3:1
2:3
3:2
For any two events A and B,P(A∩B) is
Less than P(A) + P(B) -1
Greater than P(A) + P(B)
Equal to P(A) + P(B) - P(A∪B)
Equal to P(A) + P(B) + P(A∪B)
