Question: Please answer #9 a,b,c,d & e and show how you got the answer please. Thank you! Sales for the past 12 months at Computer Success

Please answer #9 a,b,c,d & e and show how you got the answer please.
Thank you!
Sales for the past 12 months at Computer Success are given here. 9. Consider the sales data for Computer Success given in Problem 7Step by Step Solution
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