The mean length of 7 childrens' index finger is 9.4cm. The mean length of 5 adults' index finger is 10.2cm. What is the mean length (rounded to 2 DP) of these 12 people's index finger?

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DsRaj asked Sep 17, 2023

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The mean length of 7 childrens' index finger is 9.4cm. The mean length of 5 adults' index finger is 10.2cm. What is the mean length (rounded to 2 DP) of these 12 people's index finger?

Mathematics
high-school

DsRaj asked Sep 17, 2023

by DsRaj

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Answer:

9.73 cm to 2 DP

Explanation:

Total of the lengths involved = 7*9.4 + 5*10.2

= 116.8 cm

So the mean of the 12 fingers

= 116.8/12

= 9.73 cm to 2 DP.

Alexandr Vysotsky answered Sep 22, 2023

by Alexandr Vysotsky

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