I’d say the answer is B.
So, the way I’m gonna do this is to subtract 7 from 9 and then, add 3 and 4.
So, now you have (2 x 7)^2
And then, (14)^2
The standard deviation is lower for each group than it is for the groups combined.
We know that
[area of the figure]=[area of rectangle]+[area of semi circle]
area of rectangle=b*h------> 10*18-----> 180 cm²
area of semicircle=pi*r²/2
diameter=18 cm
radius=18/2----> 9 cm
area of semicircle=pi*9²/2-----> 127.17 cm²
[area of the figure]=[180]+[127.17]------> 307.17 cm²
round <span>to the nearest unit </span>------> 307 cm²
the answer is
the area of the figure is 307 cm²
