In a particular population, it was of interest whether donut shops are, on average, more profitable than ice cream shops. A random sample of firms was taken with their average annual sales (£k) given in the table below.   Year 1 2 3 4 5 6 7 Donut shop 240 290 210 174 210 150 230 Ice cream shop 210 230 187 240 230 220 174   1.1. Calculate the average mean difference between two shop sales.   1.2. Calculate the Standard deviation of difference between two shop sale giving detailed explanation

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