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
None of these
A random variable x has the following distribution ,p(x<3)is
3/5
3/10
1/10
5/12
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
If the standard deviation of a binomial distribution (q+p) 16 is 2,then its mean is
2
4
8
16
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
Suppose that 5 men out of 100 and 25 women out of 1000 are good orators.An orator is chosen at random .Find the probability that a male person is chosen .Assume that there are equal number of men and women .
2/3
3/2
-2/3
-3/2
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 coin is tossed (m+n) times (m>n).Then the probability of at least m consecutive head is
In eight throws of a die 1 or 3 is considered a success .Then the standard deviation of the success is
16 / 9
8/3
4/3
The value of C for which P(X=K)=CK2 Can serve as the probability distribution function of a random variable x that total value 0,1,2,3,4 is
1/100
1/15
1/30
