Question

The mean length of 5 childrens' index finger is 5.6cm.

Answer 1

The mean length (rounded to 2 DP) of these 8 people's index finger is 5.83

What is the mean length (rounded to 2 DP) of these 8 people's index finger?

The given parameters are:

Children

Mean = 5.6 cm

Frequency = 5

Adult

Mean = 6.2 cm

Frequency = 3

The mean length of these 8 people's index finger is calculated as:

$\bar x = \frac{\sum fx}{\sum f}$

So, we have

Mean = (5.6 * 5 + 6.2 * 3)/(5 + 3)

Evaluate

Mean = 5.83

Hence, the mean length (rounded to 2 DP) of these 8 people's index finger is 5.83

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