Let X be the random variable with probability distribution given by the following table.

X	0	1	2	3
P(X = x)	$\frac{1}{8}$	k	$\frac{3}{8}$	$\frac{1}{8}$

The value of $P(X \leq 1)$ is:

If in a binomial distribution $n = 4$, $P(X=0) = \frac{16}{81}$, then $P(X=4)$ equals :

A random variable X has the following probability distribution:

then, which of the following is correct?

How many minimum number of times must a man toss a fair coin so that the probability of having at least one head is more than 90%?

Two cards are drawn successively with replacement from a well shuffled pack of 52 playing cards. Which of the following is correct probability distribution of number of Queens(X) as $\binom{X}{P(X)}$?

When the doctor arrives late, what is the probability that he comes by cab?

A random variable X has the following probability distribution:

The value of K is