With four different sensors, V1, V2 V3, and V4 I need to develope an operational amplifier circuit to measure average temperature with following specifications:

1. The output voltage range of each sensor is limited to 0-5 V
2. The output voltage range of average temperature measurement circuit is 0-5V
3. The span adjustment range is +/- 1V
4. Total system accuracywith +/- 0.1% of FSO

Please help me to design the above circuit.