Table 6.6 Age Cholesterol Weight

	Variables:
	   X = Age, interval [a, b]
	   Y1 = Cholesterol, interval [a1, b1]
       Y2 = Weight, interval [a2, b2]

      input u a b a1 b1 a2 b2

         ---------------- 


   1  20 30  114 192  108 141
   2  30 40  103 189  111 150
   3  40 50  120 191  127 157
   4  50 60  136 223  130 166
   5  60 70  149 234  139 161
   6  70 80  142 229  143 169
   7  80 90  140 254  140 146