Final Answer:
The probability of not brown is 90%, thus the correct option is D.
Step-by-step explanation:
The spinner below consists of four colors, namely Brown, Red, Green and Yellow. The probability of each color appearing when the spinner is spun is given by 1/4. As there are four colors, the total probability of all the colors appearing is 1. To calculate the probability of not Brown appearing, we need to subtract the probability of Brown appearing from 1.
The probability of Brown appearing is 1/4. So, the probability of not Brown appearing is equal to 1 - 1/4 = 3/4. Converting this to percentage, 3/4 × 100% = 90%. Thus, the probability of not Brown appearing when the spinner is spun is 90%.