The mean length of 4 childrens’ index finger is 8.7cm. the mean length of 11 adults’ index finger is 13.4cm.

The mean length of 4 childrens’ index finger is 8.7cm. the mean length of 11 adults’ index finger is 13.4cm. what is the mean length (rounded to 2 dp) of these 15 people’s index finger?

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