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# Probability Symbols and Explanations

P(A)

Name: Probability function. Explanation: Used to represent the probability of event A.

P(A ∩ B)

Name: Probability of events intersection. Explanation: Used to represent the probability of both event A and event B.

P(A B)

Name: Probability of events union. Explanation: Used to represent the probability of event A or event B.

P(A | B)

Name: Conditional probability function. Explanation: Used to represent the probability of Event A.

(x)

Name: Probability density function.

μ

Name: Population mean. Explanation: Used to represent the mean of population values.

E(X)

Name: Expectation value. Explanation: Used to represent the expected value of variable X.

E(X | Y)

Name: Conditional expectation. Explanation: Used to represent the expected value of variable X, given variable Y.

var(X)

Name: Variance. Explanation: Used to represent the variance of variable X.

σ2

Name: Variance. Explanation: Used to represent the variance of population values.

std(X)

Name: Standard deviation. Explanation: Used to represent the standard deviation of variable X.

cov(X,Y)

Name: Covariance. Explanation: Used to represent the covariance of variables X and Y.

corr(X,Y)

Name: Correlation. Explanation: Used to represent the correlation of variables X and Y.

ρX,Y

Name: Correlation. Explanation: Same as above.

Name: Summation. Explanation: Used to represent the sum of all values that are in range in a series.

∑∑

Name: Double summation. Explanation: Same as above, but doubled!

Q1

Name: First quartile. Explanation: Used to represent the 25% of the population below this value.

Q2

Name: Second quartile. Explanation: Used to represent the 50% of the population below this value.

Q3

Name: Third quartile. Explanation: Used to represent the 75% of the population below this value.

n!

Name: Factorial.

nPk

Name: Permutation.

N(μ,σ2)

Name: Normal distribution.

U(a,b)

Name: Uniform distribution.

exp(λ)

Name: Exponential distribution.

gamma(c, λ)

Name: Gamma distribution.

χ 2(k)

Name: Chi-square distribution.

(k1, k2)

Name: F distribution.

Bin(n,p)

Name: Binomial distribution.

Poisson(λ)

Name: Poisson distribution.

Geom(p)

Name: Geometric distribution.

HG(N,K,n)

Name: Hyper-geometric distribution.

Bern(p)