Standard deviation is an important calculation for math and sciences, particularly for lab reports. Standard deviation usually is denoted by the lowercase Greek letter Ï. Here is step by step instructions for calculating standard deviation by hand.
For the Japanese company, see Invoice (company). An invoice, bill or tab is a commercial document issued by a seller to a buyer, relating to a sale transaction and indicating the products, quantities, and agreed prices for products or services the seller had provided the buyer. Payment terms are usually stated on the invoice.
(Accounting & Book-keeping) a document issued by a seller to a buyer listing the goods or services supplied and stating the sum of money due. vb. (Accounting & Book-keeping) (tr) a. to present (a customer) with an invoice. b. to list (merchandise sold) on an invoice.