The first part of the present report aims to compare and assess two published data sources concerning the situation with the market share in smartphones. In essence, it examines the market share by the operating system, as well as by share of the smartphone market by the manufacturer. Besides, the StatCounter and IDC websites have been chosen as a reliable source of information, while the report's findings have been summarized at the end. The second part of the report solve the following tasks: average sales and standard deviation, forecast for the final three months of 2020, Widjitz sales versus Android sales correlation, breakeven analysis, recommendations for each size of T-shirts. It is suitable for students in business administration, aiming  to solve their statistics tasks in an Excel table and transfer them to a Word file. 
Keywords: #smartphones market share, #average sales, #standard deviation, #correlation, #breakeven analysis, #business administration.