In a binomial distribution, the mean is 10 and the variance is 6 . Then, its median is

A four digit number is formed with digits $1,3,4$, 5 with no repetition. What is the probability that the number is divisible by 5 ?

A six faced die is a biased once. It is thrice more likely to show an odd number, then show an even number. It is thrown twice. The probability that the sum of the number in two throws is odd, is

A six faced die is a biased one. It is thrice more likely to show an odd numbers than show an even number. It is thrown twice. The probability that the sum of the numbers in two throws is even, is

Two cards are drawn from a pack of 52 cards. What is the probability that either both are red or both are kings?

If A and B are two independent events such that $P(A) = {1 \over 2}$ and $P(B) = {1 \over 5}$, then which of the following is correct?

Box I contains 5 red and 2 blue balls, while box II contains 2 red and 6 blue balls. A fair coin is tossed. If it turns up head, a ball is drawn from box I, else a ball is drawn from box II. The probability ball drawn is from box I, if it is blue, is