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The mean length of 10 childrens' big finger is 8.1cm.
The mean length of 11 adults' big finger is 14.1cm.
What is the mean length (rounded to 2 DP) of these 21 people's big finger?​

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Manissaha129idn

Answer:

  • The mean length of 10 children's big finger is 8.1 cm

Average length of all the 10 children's finger is (8.1×10) cm = 81 cm.

  • The mean length of 11 adult's big finger is 14.1 cm

Average length of all the 11 adult's big finger is (14.1×11) cm =155.1

  • Mean length of these 21 people's big finger is
  • [tex] \frac{(81 + 155.1)}{21} = 11.242857[/tex]
  • Hence, 11.24 is the right answer.
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