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allyfontela allyfontela
  • 15-03-2017
  • Mathematics
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Аноним Аноним
  • 15-03-2017
To find the mean Just add up all the numbers, then divide by how many numbers there are.

7 sets of numbers
the sum of all numbers is 105

105 
÷ 7 = 15

so the mean of the years is 15
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