Consider a random variable with the following probability distribution:  X          P(X) 0          0.25 1          0.5 2          0.25   What is the expected value (mean) of X?

Find E(X), Var(X), and the standard deviation of X, where X is the random variable whose probability table is given in the table below. Outcome 1 2 3 1 1 Probability 5 5 What is the expected value of the random variable X associated with the probability table given in the problem statement? E(X) = 12 5 (Type an integer or a simplified fraction.) What is the variance of the random variable X? Var(X) = (Type an integer or a simplified fraction.) 35 ■ . = C (-) Moro

The probability distribution of the number of students absent on Mondays, is as follows: X O 1 2 3 4567 f(x) 0.02 0.03 0.26 0.34 0.22 0.08 0.04 0.01 (a) What is the probability that more than 3 students are absent. (b) Compute the expected value of the random variable X. Interpret this expected value. (c) Compute the variance and standard deviation of the random variable X. (d) Compute the expected value and variance of Y : (e) Compute the covariance Cov(X, Y) = 7X+ 3. (f) What is the value of the ratio Cov(X,Y)/Var(X) ? (g) What is the value of Cov(X, Y)/Var(X) for Y = ß0 + ß₁X ? (For this exrcise, you can use excel. No need to show all calculations, just specify the formulas and present the final values.) (a) (b) (c) (d) (e) (f) (g)

A random variable X has the following distribution: X P(X=x) -1 .3 0 1 .5 2 Let Y=X². Find the expected value of random variable Y. 0.38 0.6 5 4 O-1