If X and Y are independent random variables with means E[X] = 2 and E[Y] = 3, what is the expected value of XY?Review LaterE[XY] = 5E[XY] = 6E[XY] = 7E[XY] = 8
Question
If X and Y are independent random variables with means E[X] = 2 and E[Y] = 3, what is the expected value of XY?
- E[XY] = 5
- E[XY] = 6
- E[XY] = 7
- E[XY] = 8
Solution
Break Down the Problem
- Identify the given values: We have two independent random variables, X and Y, with means and .
- Determine the formula: For independent random variables, the expected value of their product is the product of their expected values, i.e., .
Relevant Concepts
- Independence of Random Variables: For independent random variables and , we know that:
Analysis and Detail
-
Substituting the Values:
- Substituting the means:
-
Perform the Calculation:
Verify and Summarize
- Verification:
- Independent random variables mean we can multiply their expected values. Thus, our calculation checks out.
- Summary: The expected value of the product of independent random variables and is confirmed to be 6.
Final Answer
Similar Questions
If 𝑋X and 𝑌Y are independent random variables with 𝐸[𝑋]=1E[X]=1, Var(𝑋)=2Var(X)=2, 𝐸[𝑌]=3E[Y]=3, and Var(𝑌)Var(Y) = 4, then find 𝐸[(2𝑋+3𝑌)2]E[(2X+3Y) 2 ].
f X is a random variable with possible outcomes 3 and 8, with P( X = 3) = 0, then E(X) is
If X is a random variable with possible outcomes 3 and 8, with P( X = 3) = 0, then E(X) is
Let X and Y be two continuous random variables, Find E(X+Y)*E(X)+E(Y)E(X)-E(Y)E(X)E(Y)E(X)/E(Y)
The coefficient of correlation between the two variables X and Y is 0.6. Their covariance is 3.6 and variance of X is 4. The variance of Y is3.55.54.59
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.