Broker-to-Carrier Spot Rates, the average is an average of all rate submissions, scaling down the importance of the rate submissions from the largest contributors on the lane. No one rate contributor can contribute as 50% of the average rate. The average is not usually in the middle of the range which is the range excluding the top 25% of rates and the bottom 25% of rates submitted.
Shipper-to-Carrier Contract Rates, the average is a weighted average of rate submissions. It is in the middle of the range when the high is calculated by adding 1 standard deviation to the average and the low is calculated by subtracting 1 standard deviation from the average.