Find the average of $80, 90, 100, 110, 120, 130$ .

100

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105

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110

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115

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Solution

The correct option is B $105$
Given numbers $= 80, 90, 100, 110, 120, 130$
Average $= \frac{Sum of observations}{Number of observations}$

Average $= \frac{80 + 90 + 100 + 110 + 120 + 130}{6}$

$= \frac{630}{6} = 105$

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