Which of the following is a discrete random variable?, The height of students in a class, The number of students in a class, The time taken to run a marathon, The temperature in a city, Which of the following best defines a random variable?, A variable that can take on any valuein a given range, A variable whose possible values are numerical outcomes of a random phenomenon, Avariable that changes its value randomly over time, A constant value determined by a probability experiment, What does the notation P(X=x) refer to:, The probability that the random variable X takes on a value less than x., The probability that the random variable X takes on the value x., The cumulative distribution function of X., The mean of the random variable X., Which of the following is not true about dicrete random variables?, They can take on an infinite number of values, They can take on a finite or countably infinite set of values, Their probabilities sum to 1, they have an associated probability mass function, Which of the following is not true about discrete random variables?, For a probability mss functions to be valid, which of the following must be true?, All probabilities must be negative, The sum of all probabilities must be less than 1, The sum of all probabilities must equal 1, Each probability must be greater than 1, If X is a discrete random variable with P(X =x), which of the following statements is correct?, The probability mass functions of a discrete random variables X is given by P(X =x) = 1/5 for x = 1,2,3,4,5. What is P(X=2)?, 1/2, 1/5, 2/5, 3/5, What is the formula for expected value (mean) of a discrete random variable X with probability mass function P(X)?, Which of the following formulas represents the variance of a discrete random variable X?

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