Question

Please help !The mean length of 10 childrens' index finger is 5.9cm.

The mean length of 7 adults' index finger is 7.7cm.

What is the mean length (rounded to 2 DP) of these 17 people's index finger?

Answer 1

6.64cm

Explanation:

59 is total length of children's finger

53.9 is total length of adults finger

112.9 is total length of all 17 index fingers

6.64 is the mean length (112.9 divided by 17 and rounded to two DP)