3 years ago

The mean length of 10 childrens' big finger is 8.1cm.

Mathematics

1 answer:

sergiy2304 [10]3 years ago

8 0

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
$\frac{(81 + 155.1)}{21} = 11.242857$
Hence, 11.24 is the right answer.

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