waecmaths question:
In an examination, Kofi scored x% in Physics, 50% in Chemistry and 70% in Biology. If the mean score for the three subjects was 55%, find x
Option A:
40
Option B:
45
Option C:
55
Option D:
60
waecmaths solution:
$\begin{array}{*{35}{l}} & \bar{x}=55percent \\ & \bar{x}=\frac{x+50+70}{3} \\ & x+120percent=165percent \\ & x=45percent \\\end{array}$
maths year:
maths topics: