Question

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?

Answer 1

The mean length of these 12 people's big finger is of 7.85 cm.

Explanation:

Mean value:

Sum of the values of all observations divided by the number of observations.

In this question:

9 + 3 = 12 total observations

Sum:

`9*6.8 + 3*11 = 94.2`

So

`M = (94.2)/(12) = 7.85`

The mean length of these 12 people's big finger is of 7.85 cm.