Web16 jan. 2024 · 2. If X an Y are independent and normal then Var (2X-Y)=4Var (X) +Var (Y) and since Var (X) =Var (Y)=4 the answer is 4x4+4=20. However as Mark Stone has pointed out if X and Y are correlated (in this case negatively correlated the Cov (X,Y) would be negative and so the variance for Z=2X-Y will be less than 20. Now the means add … WebDefinition \(\PageIndex{1}\) The probability mass function (pmf) (or frequency function) of a discrete random variable \(X\) assigns probabilities to the possible values of the random variable.More specifically, if \(x_1, x_2, \ldots\) denote the possible values of a random variable \(X\), then the probability mass function is denoted as \(p\) and we write
Var(XY), if X and Y are independent random variables
WebVerified answer. precalculus. A jar contains ten red balls labeled 0,1,2, \ldots, 9 0,1,2,…,9 and five white balls labeled 0,1,2,3,4 0,1,2,3,4. If a ball is drawn from the jar. find the … Web28 feb. 2024 · asked Feb 28, 2024 in Statistics by Rohit01 (55.1k points) If V (X) = 4 then find V (2X). random variables mathematical expectation class-11 1 Answer +1 vote answered Feb 28, 2024 by KhusbuKumari (51.4k points) selected Feb 29, 2024 by … passive antenna array
If x^2 = 2^x, what is the value of x ? : Data Sufficiency (DS)
WebVerified by Toppr Correct option is A) If a random variable X is adjusted by multiplying by the value b and adding the value a, then the variance is affected as follows: σ a+bX2 =b 2σ … Web3 jul. 2024 · No, that is not the case - you're not using the information in the question stem, that x 2 = 2 x. Here when analyzing Statement 2, if we notice that x must be nonzero, we … WebThe variance of random variable X is the expected value of squares of difference of X and the expected value μ. σ 2 = Var ( X ) = E [ ( X - μ) 2] From the definition of the variance we can get σ 2 = Var ( X ) = E ( X 2) - μ2 Variance of continuous random variable お札 順序