Mathematics, 21.10.2020 16:01 amaraea
Suppose that X is a random variable with mean 20 and standard deviation 5. Also suppose that Y is a random variable with mean 40 and standard deviation 10. Assume that the correlation between X and Y is 0.5. Find the mean and variance of the random variable Z = 3X 2Y . Be sure to show all your work.
Answers: 2
 
![E(Z) = E[2 + 10X ]](/tpl/images/0827/6692/580f9.png)
    ![E(Z) = E[10X -2 ]](/tpl/images/0827/6692/cc5dc.png)
![E(Z) = E[-3X -2Y ]](/tpl/images/0827/6692/7d949.png)
Another question on Mathematics
Mathematics, 21.06.2019 18:30
What is the prime factorization of 23 ?me with this question
Answers: 1
Mathematics, 21.06.2019 19:00
Through non-collinear points there is exactly one plane.
Answers: 1
Mathematics, 21.06.2019 23:00
Unaware that 35% of the 10000 voters in his constituency support him, a politician decides to estimate his political strength. a sample of 200 voters shows that 40% support him. a. what is the population? b. what is the parameter of interest? state its value c. what is the statistics of the interest? state its value d. compare your answers in (b) and (c) is it surprising they are different? if the politician were to sample another 200 voters, which of the two numbers would most likely change? explain
Answers: 2
Mathematics, 22.06.2019 00:00
Add, subtract, multiply, or divide as indicated. list any restrictions for the variable(s) and simplify the answers when possible. 1) x-2 / x+5 + 3x / 2x-1 2) x+6 / x-6 - x^2 / x+6 3) x+9 / x-4 + x+2 / x^2-11x+28 4) x / x^2-64 + 11 / 2x^2+11x-40 5) 5 / x + 11 / x-3 - x-4 / x^2+2x-15
Answers: 1
You know the right answer?
Suppose that X is a random variable with mean 20 and standard deviation 5. Also suppose that Y is a...
Questions
Social Studies, 03.05.2020 13:11
Mathematics, 03.05.2020 13:11
Mathematics, 03.05.2020 13:11
History, 03.05.2020 13:11
Spanish, 03.05.2020 13:11
History, 03.05.2020 13:11
Mathematics, 03.05.2020 13:11
Mathematics, 03.05.2020 13:11
