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
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 coin is tossed (m+n) times (m>n).Then the probability of at least m consecutive head is
In a Binomial distribution ,the probability of getting a success is 1/4 and standard deviation is 3 .Then its mean is
6
8
12
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
If the standard deviation of a binomial distribution (q+p) 16 is 2,then its mean is
2
4
16
If X is a random variable with the following distribution then K=____________.
1/8
1/4
1/6
1/2
Probability of getting heads in all the three trials,when a balanced coin is tossed thrice,will be
1
