Mathematics, 04.03.2021 14:00, gonzalesalexiaouv1bg

The mean length of 9 childrens' big finger is 6.8cm. The mean length of 3 adults' big finger is 11cm.
What is the mean length (rounded to 2 DP) of these 12 people's big finger?

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The mean length of 9 childrens' big finger is 6.8cm. The mean length of 3 adults' big finger is 11c...