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Answer variants:
680
13.125
681
10.125
679
11.125
1. The arithmetic mean of 8 observations is 85. If each observation is multiplied by 8, then the new arithmetic mean for the new set of values is .
2. The arithmetic mean of 7 observation is 89. If each observation is divided by 8, then the new arithmetic mean for the new set of values is .
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