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Mathematics, 03.08.2019 23:30 yungkxng57

In a store, a sample of 60 pens was selected from a box of 1,200 pens. of these 60, 4 pens did not work. about how many pens could be expected to not work in the group of 1,200 pens?

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In a store, a sample of 60 pens was selected from a box of 1,200 pens. of these 60, 4 pens did not w...
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