Insert the missing number in the number pattern given below.

3.7

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3.8

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3.9

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3.1

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Solution

The correct option is A $3.9$
$(8 + 13 + 9 + 5) / 10 = 35 / 10 = 3.5$
$(9 + 12 + 8 + 7) / 10 = 36 / 10 = 3.6$
so then $(7 + 11 + 12 + 9) / 10 = 39 / 10 = 3.9$

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