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= (213,6 + 7,74) / 31
= 221,34 / 31
= 7,14
mean = [(30 × 7,12) + (1 × 7,74)] ÷ (30 +1)
= (213,6 + 7,74) ÷ 31
= 221,34 ÷ 31
=7,14
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