Consider a wind machine designed to deliver its rated power at the average velocity for a given wind spectrum. It will be marketed for sites having wind velocity spectra that have the same annual average velocity but with Weibull statistics ranging from k = 3/2 to 5/2. a. Calculate the ratio of maximum to minimum annual average on-site wind power available for exploitation for this range of wind fields. b. What additional assumptions are necessary if the power actually produced is to be in the same ratio as in (a) above?