I am working on an analysis of new delivery charges and and comparing existing pricing with a proposed new pricing.
I have 84k orders which I have calculated the average and standard deviation of difference in pricing between current/proposed pricing.
avg = =£1.03
stdDev = £40.25
80k of my order fall within 1 stdDev and in terms of value its £150k positive.
Is a stdDev of 40.25 good or bad? high or low? should it be closer to the avg in order to be more useful as info??