Answer: A
Step-by-step explanation:
Answer:
The new mean is 77cm
Step-by-step explanation:
If the mean height of the 30 children in a room is 76 cm, then the sum of their ages is

If James with height 107cm joins them, then the total number of children now becomes 30+1=31 and the total height becomes: 2280cm+107cm=2387cm
The new mean now becomes:

Answer:
C
......................................................
There is no figure of the triangle, all that I know about it is
<span>cos Pi/6
=√3/2</span>