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How do I calculate the standard deviation here?

score 33 · Answer 1 · 2026-04-01 23:49:30

33

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How do I calculate the standard deviation here?

Published on 01 Apr 2026 - 23:49

score 71 · Answer 2 · 2020-08-07 07:04:48

71

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Given joint pdf, how can I find $\operatorname{Var}(X)$ without using the marginal distribution of $X$?

Published on 07 Aug 2020 - 7:04

score 32 · Answer 3 · 2020-08-09 08:12:57

32

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Can a Kalman filter deal with unexpectedly noisy measurements?

Published on 09 Aug 2020 - 8:12

score 98 · Answer 4 · 2020-08-10 09:18:30

98

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Standard deviation of assets?

Published on 10 Aug 2020 - 9:18

score 44 · Answer 5 · 2020-08-10 11:25:11

44

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Seccurity Market Line and beta value?

Published on 10 Aug 2020 - 11:25

score 107 · Answer 6 · 2026-03-28 05:21:52

107

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Concentration for Markov process with known expectation and variance?

Published on 28 Mar 2026 - 5:21

score 147 · Answer 7 · 2026-04-01 17:32:12

147

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How can I convert from a sample Correlation matrix to a sample Covariance matrix?

Published on 01 Apr 2026 - 17:32

score 215 · Answer 8 · 2026-04-01 17:28:49

215

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$X_1^2+X_2^2+X_3^2 = 1$, what is the range of correlation between $X_i, X_j$?

Published on 01 Apr 2026 - 17:28

score 2k · Answer 9 · 2020-08-14 15:21:54

2k

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Number of fixed points of a random permutation

Published on 14 Aug 2020 - 15:21

score 52 · Answer 10 · 2020-08-14 16:38:52

52

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What are the values for $ \lim_{ n \to \infty } E[(\overline{X}_n)^2] $ and $ \lim_{ n \to \infty } V[(\overline{X}_n)^2] $?

Published on 14 Aug 2020 - 16:38

score 106 · Answer 11 · 2020-08-15 09:28:41

106

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How to get started on the problem $\text{Var}(fg) \le 2\text{Var}(f)M(g)^2 + 2\text{Var}(g)M(f)^2$ where $M(h) = \max\limits_{x \in [0,1]} |h(x)|.$

Published on 15 Aug 2020 - 9:28

score 33 · Answer 12 · 2020-08-18 17:43:00

33

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Deriving expectation and variance for Binomial random variable

Published on 18 Aug 2020 - 17:43

score 1.5k · Answer 13 · 2020-08-19 06:55:37

1.5k

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Variance of Sum of 100 dice rolls?

Published on 19 Aug 2020 - 6:55

score 135 · Answer 14 · 2026-04-03 23:00:19

135

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Expectation and variance of dice throwing game.

Published on 03 Apr 2026 - 23:00

score 34 · Answer 15 · 2026-04-02 05:01:55

34

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Unbiased estimation of $p$ given $g_p(x)=p\frac{a^x}{x!}e^{-a}+(1-p)\frac{b^x}{x!}e^{-b}$

Published on 02 Apr 2026 - 5:01

List Question

How do I calculate the standard deviation here?

Given joint pdf, how can I find $\operatorname{Var}(X)$ without using the marginal distribution of $X$?

Can a Kalman filter deal with unexpectedly noisy measurements?

Standard deviation of assets?

Seccurity Market Line and beta value?

Concentration for Markov process with known expectation and variance?

How can I convert from a sample Correlation matrix to a sample Covariance matrix?

$X_1^2+X_2^2+X_3^2 = 1$, what is the range of correlation between $X_i, X_j$?

Number of fixed points of a random permutation

What are the values for $ \lim_{ n \to \infty } E[(\overline{X}_n)^2] $ and $ \lim_{ n \to \infty } V[(\overline{X}_n)^2] $?

How to get started on the problem $\text{Var}(fg) \le 2\text{Var}(f)M(g)^2 + 2\text{Var}(g)M(f)^2$ where $M(h) = \max\limits_{x \in [0,1]} |h(x)|.$

Deriving expectation and variance for Binomial random variable

Variance of Sum of 100 dice rolls?

Expectation and variance of dice throwing game.

Unbiased estimation of $p$ given $g_p(x)=p\frac{a^x}{x!}e^{-a}+(1-p)\frac{b^x}{x!}e^{-b}$

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