Question

how do you construct a age pyramid. i have the age class and observed individuals how do i get the present in each age class
Ms. Sue
http://www.google.com/search?q=age+pyramid&rlz=1C1AVSX_enUS414US423&es_sm=122&tbm=isch&tbo=u&source=univ&sa=X&ei=s4xIUo_wKuLCyQGvm4CgDg&ved=0CDQQsAQ&biw=711&bih=453&dpr=1