Mean function for exponential series.

Computes the expected value of a series system with exponentially distributed component lifetimes. For a series system with component rates λ₁,...,λₘ, the system lifetime is exponential with rate Σλⱼ, so ET = 1/Σλⱼ.

Usage

# S3 method for class 'exp_series'
mean(x, ...)

Arguments

x

An object of class exp_series (a vector of rate parameters).

...

Additional arguments (ignored, for S3 generic compatibility).

Value

The mean of the exponential series distribution (1/sum of rates).