Number of Items Arriving at Work Center per Hour 155 115 156 150 159 163 172 143 159 166 148 175 151 161 138 148 129 135 140 152 139 Number of Items Departing Work Center per Hour 156 109 127 148 135 119 140 127 115 122 99 106 171 123 135 125 107 152 111 137 161 Applying the Concepts—Advanced