If X denotes the number of sixes in throwing two dice, find the expectation of x

Two dice are thrown simultaneously.If X denotes the number of sixes,find the expectation of X .

If x denotes the number of sixes in four consecutive throws of a dice, then P(x=4) is

Let a pair of dice be thrown and the random variable X be the sum of the numbers that appear on the two dice.Find the mean or expectation of X.

If getting a '5' or a '6' in the throw of an unbiased die is a 'success' and the random variable 'X' denotes the number of succeses in six throws of the die, find P_(X)[X = 4, 5 , 6] .

Statement -1 : Let x denotes the number of sixes in 3 consecutive throws of die, then P(x=3)=1/216 Statement-2 : The probability that sum of faces appeared is 10, when three dice are rolled is (""^9C_7)/(6^3)

Find the probability distribution of the random variable x,which denotes the number of doublets in four throws of a pair of dice.Hence,find the mean of the number of doublets (X).

In a single throw of a dice; if X denotes the number on its upper face.Find the mean of X.

If getting 5 or 6in a throw of an unbiased die is a success and the random vriable X denotes the number of successes in six throws of the die,find P(X=4)

Let X denote the number of times 'a total of 9' appears in two throws of a pair of dice. Find the probability distribution of X. Also, find the mean, variance and standard deviation of X.