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nataly862011 [7]
2 years ago
13

The mean length of 6 childrens' big finger is 12.6cm.

Mathematics
1 answer:
malfutka [58]2 years ago
8 0

14.94 cm ( to 2 dec. places )

We require the sum totals of the 2 groups before calculating the mean of all 14

using mean = \frac{sum}{count}

Children's sum

12.6 = \frac{sum}{6}( cross-multiply )

sum = 6 × 12.6 = 75.6

Adult's sum

16.7 = \frac{sum}{8}( cross- multiply )

sum = 8 × 16.7 = 133.6

Total sum of all 14 = 75.6 + 133.6 = 209.2

mean = \frac{209.2}{14} = 14.94 cm


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