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When a fair dice is rolled once, then the mean of the random variable X, which denotes the number appearing the upper most face of the dice is 7.

Find the probability distribution of a random variable X which denotes the number of tails in two tosses of a coin.

Three cards are drawn in succession form a well shuffled pack of 52 cards. Determine the probability distribution of the random variable X which denotes the number of spades in the three cards. Hence find the mean of the distribution.

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.

An unbiased coin is thrown thrice. If the random variable X denotes the number of heads obtained, describe the probability distribution of X .

Find the probability distribution of the random variable X which denotes the number of ites 'a total of 9' appears in two thros of a pair of dice. Sketch its graph.

If getting '5' or '6' in a throw of an unbiased dice is a success and the random variable 'X' denotes the number of success in six throws of the dice, find P(Xge4).

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 successes in six throws of the die, find P_X[Xge4]

From a lot of 10 items containing 3 defective items a sample of 4 items is drawn at random. Let the random variable 'X' denote the number of defective items in the sample. If the sample is drawn without replacement, find: mean of X.

From a lot of 10 items containing 3 defective items a sample of 4 items is drawn at random. Let the random variable 'X' denote the number of defective items in the sample. If the sample is drawn without replacement, find: the probability distribution of X.