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The video helps you in finding mean and median which also shows an example solved and further you also find help with Mode Median Mean - http://www.mathcaptain.com/statistics/mean.html

The simplest and most accurate definition of an invoice is that it is a document that a seller gives a buyer to collect on a payment. It usually includes the cost of the goods or services rendered and outlines the mode and date of payment. An invoice serves as a legal document and must contain specific details required for its validity. These include the names of the client, the terms of payment, a description of the goods or services delivered, and the cost. An invoice serves as proof of a purchase made between you and your customer as a business entity. Read the full article here: https://brodmin.com/invoicing/what-is-an-invoice/