Expected Value and Variance

Expected Value and Variance for the distribution of a discrete random variable. (For didactical purposes..)

EX(x, p)
VarX(x, p)

Arguments

x

the values of the random variable

p

the probabilities of the values

Value

numeric value

Author

Andri Signorell <andri@signorell.net>

Examples

EX(x=c(1:3), p=c(0.2, 0.5, 0.3))
#> [1] 2.1
VarX(x=c(1:3), p=c(0.2, 0.5, 0.3))
#> [1] 0.49