`interpolate``selector-function``value-vector``percent`procedureGiven a

`selector-function`this produces a value within the range of values defined in`value-vector`that is representative of the provided`percent`.`value-vector`must be a vector of numbers.`percent`must be a value between 0.0 and 1.0.`selector-function`must be of the form`value-vector -> percent -> number`Various selector functions are provided by this egg, see below.