How to use Standard Deviation for Market Intelligence. ->What is Standard Deviation?

Standard deviation is strength of your  data values  Steps to calculate the formula  1. Work out the Mean (the simple average of the numbers) 2. Then for each number: subtract the Mean and square the result 3. Then work out the mean of those squared differences. 4. Take the square root of that. Results 1 Std means 68% of strength 2 std mens 95% and 3 std means 99% strength. Simply a retail industry just make the paint size in some area he take the data of length size of persons and calculate the std and if they got the 3 std with 170 cm length they easily decide their paint length. Regards Zafarhakeeem@gmail.com +971554443206