A fair coin is tossed until a head or five tails occur. If X denotes the number of tosses of the coin, find mean of X.

A fair coin is tossed until a head or 5 tails occur. If X denote the number of tosses of the coin, find the mean of X.

A coin is tossed until a tail appears what is the expectation of the number of tosses ?

A coin is tossed until a head appears. What is the expectation of the number of tosses required ?

A coin is tossed until a head appears. What is the expectation of the number of tosses required ?

If 10 coins are tossed then mean and variance of x and x denotes the number of heads is

A fair coin is tossed 4 times. If X denotes the number of heads obtained, then the formula for p.m.f. of X is

A balanced coin is tossed repeatedly until a tail appears if x denotes the number of heads preceding the first tail find the probability distribution of x

A fair coin is tossed four times. Let X denote the number of heads occurring. Find the probability distribution, mean and variance of X.

A fair coin is tossed until one of the two sides occurs twice in a row. The probability that the number of tosses required is even is