A pair of dice thrown five times. The probability that doublets appear atleast 3 times is
A and B are events such that
A = B
P(A) = P(B)
A and B are independent
All of the above
One Indian and four American men and their wives are to be seated randomly around a circular table. Then the
conditional probability that the Indian man is seated adjacent to his wife given that each American man is seated
adjacent to his wife, is
A group of 10 boys are randomly divided in to two teams containing 5 boys each. The probability that the two tallest boys in different team is
A box contains 8 white and 4 black balls. The balls are drawn randomly one by one until those of the same colour left
in the box. The probability that they are white, is
A and B stand in ring along with 10 other persons. If the arrangement is at random, the probability, that there are
exactly 3 person between A and B, is
A bag contains 7 tickets numbered 0,1,2,...6. Four tickets are drawn one by one with replacement. The probability that
the sum of the numbers on them is 8, is
Let A and B be two events such that
mutually exclusive and independent
independent but not equally likely
equally likely but not independent
equally likely and mutually exclusive
If in a frequency distribution the mean and median are 21 and 22 respectively, then its mode is approximately
24.0
25.5
20.5
22.0
The average marks of boys in a class is 52 and that of girls is 42. The average marks of boys and girls combined is 50.
The percentage of boys in the class is
40%
20%
80%
60%
