IMAS 2014 Junior Round 1 Question 6

Question 6

A circular spinner is divided into eight equal sectors. Two of them are painted red, two black, three white and one yellow. What is the probability for the pointer of the spinner to be pointing at a black sector?

Question illustration

$\frac{3}{4}$
$\frac{1}{4}$
$\frac{3}{8}$
$\frac{1}{8}$
$\frac{1}{2}$