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 =
Children's sum
12.6 = ( cross-multiply )
sum = 6 × 12.6 = 75.6
Adult's sum
16.7 = ( cross- multiply )
sum = 8 × 16.7 = 133.6
Total sum of all 14 = 75.6 + 133.6 = 209.2
mean = = 14.94 cm
Answer:
(B)
Step-by-step explanation:
The given options are:
A. 2, 2,
B. 9,40, 41
C.
In order to prove that the given side lengths form a right triangle, we will satisfy the Pythagoras theorem.
A.
⇒
⇒
which does not satisfy the theorem, thus this option is incorrect.
B.
⇒
⇒
which satisfies the theorem, thus this option is correct.
C.
⇒
⇒
which does not satisfy the theorem, thus this option is incorrect.