Based on the ages of the children in the group, the mean age of the entire group is 8 years old.
The mean is the average of the ages of all the children in the group.
There are 3 children aged 10 and 2 children aged 5. The mean is therefore:
= Sum of ages / Number of children
= (10 + 10 + 10 + 5 + 5) / 5
= 40 / 5
= 8 years
In conclusion, the mean age is 8 years old.
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