A shop sold 5 types of items over a week: 120, 150, 110, 130, and 140 units respectively. After receiving a return of 10 units from the first item, what is the new arithmetic mean (in units) of items sold?
128
First, add the units of the five items as originally sold: \(120 + 150 + 110 + 130 + 140 = 650\) units.
A return of 10 units comes from the first item, so this quantity is subtracted from the total sold: \(650 - 10 = 640\) units.
The number of item types remains 5, so divide the adjusted total by 5 to get the new mean: \(\frac{640}{5} = 128\).
Hence, the new arithmetic mean of items sold is 128 units.
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