i need the answe for these question with excel and without excel.pls

Problem: The Best Buy has recorded sales (in units) for three products during the last 15 workdays: 1. Plot the three time series variables to determine their pattern (using Excel). 2. Forecast workday 16 sales for each of the products using an appropriate naive method. And justify each calculation using naive method (in each case). Problem: Given the quarterly demand from 2017 to 2022, forecast the quarterly demand in 2023 using Annual averages method