Function mean

mean(iterable): number | undefined
Return the mean of an array of numbers
Parameters
- iterable: Iterable<Numeric>
Returns number | undefined
mean<T>(iterable, accessor): number | undefined
Return the mean of an array of numbers
Type Parameters
- T
Parameters
- iterable: Iterable<T>
- accessor: ((datum, index, array) => number)
  - - (datum, index, array): number
    - Parameters
      datum: T
      index: number
      array: Iterable<T>
      Returns number
Returns number | undefined