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11 December, 03:41

The mean length of 6 childrens' big finger is 6.7cm.

The mean length of 11 adults' big finger is 14.3cm.

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

cm

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Answers (1)
  1. 11 December, 06:47
    0
    New mean length of these 17 people=11.62

    Step-by-step explanation:

    Step 1: Determine the total length of children's fingers

    L=l*n

    where;

    L=total length (cm)

    l=mean length (cm)

    n=number of children

    replacing;

    L=6.7*6=40.2 cm

    The total children's fingers length=40.2 cm

    Step 2: Determine the total length of adults fingers

    total length of adults fingers=mean length of adults fingers*number of adults

    where;

    mean length of adults=14.3

    number of adults=11

    replacing;

    total length of adults fingers = (14.3*11) = 157.3 cm

    Step 3: Determine the new mean length

    new mean length=total length of adults and children fingers/number of adults and children

    where;

    total length of adults and children fingers=157.3+40.2=197.5 cm

    number of adults and children=11+6=17

    replacing;

    new mean length=197.5/17=11.62
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