276 COLLECTION OF STATISTICS. 



1000 

 The reduced annual coupe would be = - =100 acres. 



Area of a coupe in each block : 



(1) '6 ; '4 = 100 ; #anda; = ' 4 = 66'67 acres. 



*O 



(2) '5: -4 = 100:* * = - = 80 



"5 



(3) '4: '4 = 100: x x 



(4) '3: -4 = 100:# o^ = 133'33 



*3 



as before. 



(b) Calculation with any Standard Quality. In this case 

 the several areas are multiplied by their respective quality 

 figures, and the sum of these products represents the reduced 

 area; in other words the standard quality is placed equal 

 tol. 



Example : as above : 



(1) 200 X '6 = 120 acres 



(2) 100 X '5= 50 



(3) 200 x '4= 80 



(4) 500 x -3 = 150 



Total reduced area = 400 acres. 



A r\c\ 

 Eeduced area of annual coupe = - = 40 acres. 



Size of coupe in each block : 



(1) '6 : '1=40 : xandx==^ = 66'67 acres 



*D 



(2) -5: '1 = 40:* * = ^j= 80 



(3) '4: '1=40:* * = ^=100 



(4) -3: '1 = 40:* a; = 4 5 = 133-33 



o 



as before. 



