To determine the picking efficiency, we first need to calculate the total standard lines that should have been picked based on the given data. The formula to calculate this is: total standard lines = (number of shifts) x (number of hours per shift) x (number of pickers per shift) x (standard lines per picker per hour). Plugging in the values, we get: (2 shifts) x (7 hours) x (6 pickers) x (100 lines per picker per hour) = 8,400 standard lines. The team picked 8,700 lines. To find the picking efficiency, we use the formula: picking efficiency = (actual lines picked / standard lines) x 100%. Thus, picking efficiency = (8,700 lines / 8,400 lines) x 100% = 103.6%. This means the efficiency is 103.6%.