If a pair of dice is thrown and x denotes the sum of the numbers on them the expectation of x is k find the value of k

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 the sum of the roots of the equation x^2-x=K(2x-1) is zero, then find the value of K.

In a single throw of a die if x denotes the number on its upper face lthe mean of x is (k)/(2) what will be the value of k?

If the sum of the square of the roots of the equation 6x^2+x+k=0 is 25/36 , then find the value of k.

Two fair dice are thrown. The probability that the sum of the numbers on the upper face is 5, is

Two unbiased dice are thrown. What is the probability that the sum of the numbers on the dice is 9?

Two dice are thrown at a time.The probability that the sum of two numbers is equal to 5 is

Two dice are rolled.Let's r denotes the sum of the number appearing on the two dices , then calculate the probability that r/3 is an integer.