If the following wheel is spun, what is the probability of obtaining a non-green sector?

The probability of an event is given as:

Probability of an event = $\frac{\mathrm{Outcomes} \mathrm{of} \mathrm{an} \mathrm{event}}{\mathrm{Total} \mathrm{possible} \mathrm{outcomes}}$

There is a total of 8 sections of the wheel. Therefore, the total number of possible outcomes is 8. 
There are 6 non-green sections on the wheel. 

$\therefore$Probability of getting non-green sectors$=\frac{6}{8}=\frac{3}{4}$

Therefore, $\frac{3}{4}$ is the correct response.