List questions from variance

Published on 11 Dec 2018 - 0:29

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How can I find the expectation and variance of $Z=\max\{X,Y\}$ where $X$ and $Y$ are defined through joint probability distribution?

Published on 13 Dec 2018 - 16:26

75

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Variance of the stochastic process

Published on 13 Dec 2018 - 18:01

297

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$Var[W]$ when $W = X - 2Y$

Published on 13 Dec 2018 - 23:24

413

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SOA Practice Exam: How am I to understand P(Z=z)?

Published on 25 Mar 2026 - 3:20

34

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Let $s^2=\frac{1}{n}\sum_1^n( X_i-\bar{X})^2$ and $\widetilde{X}$ denote the sample median. Is $s^2\leq \widetilde{X}(1-\widetilde{X})$ true

Published on 25 Mar 2026 - 7:45

89

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Find combination given expectation and variance

Published on 16 Dec 2018 - 5:36

40

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Calculate the variance of $f_X(x)$

Published on 16 Dec 2018 - 22:26

104

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$\mathbb{E}X^2 = \mathbb{E}Y^2$ and $\mathbb{E}(Y|\mathcal{A}) = X$ P-a.s. $\Rightarrow X=Y$ P.-a.s.

Published on 26 Mar 2026 - 19:37

272

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Can off-diagonals be nonzero for covariance matrix after PCA?

Published on 25 Mar 2026 - 17:26

913

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Variance of ratio of mean value of functions of a random variable

Published on 25 Mar 2026 - 17:21

827

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Let $V_1$ be the variance of the estimated mean from a stratified random sample of size $n$ with proportional allocation.

Published on 25 Mar 2026 - 3:22

370

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Variance of $XY(1-Y)$ in terms of the means and variances $X$ and $Y$

Published on 23 Dec 2018 - 5:42

69

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$E(X(t)X(t))=\sigma^2\delta(\tau)$ or $E(X(t)X(t))=\sigma^2$

Published on 25 Mar 2026 - 0:07

67

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Calculating variance of given formula

Published on 25 Dec 2018 - 9:24

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Coin toss- expected value.

How can I find the expectation and variance of $Z=\max\{X,Y\}$ where $X$ and $Y$ are defined through joint probability distribution?

Variance of the stochastic process

$Var[W]$ when $W = X - 2Y$

SOA Practice Exam: How am I to understand P(Z=z)?

Let $s^2=\frac{1}{n}\sum_1^n( X_i-\bar{X})^2$ and $\widetilde{X}$ denote the sample median. Is $s^2\leq \widetilde{X}(1-\widetilde{X})$ true

Find combination given expectation and variance

Calculate the variance of $f_X(x)$

$\mathbb{E}X^2 = \mathbb{E}Y^2$ and $\mathbb{E}(Y|\mathcal{A}) = X$ P-a.s. $\Rightarrow X=Y$ P.-a.s.

Can off-diagonals be nonzero for covariance matrix after PCA?

Variance of ratio of mean value of functions of a random variable

Let $V_1$ be the variance of the estimated mean from a stratified random sample of size $n$ with proportional allocation.

Variance of $XY(1-Y)$ in terms of the means and variances $X$ and $Y$

$E(X(t)X(t))=\sigma^2\delta(\tau)$ or $E(X(t)X(t))=\sigma^2$

Calculating variance of given formula

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