A science teacher keeps a bag of dice, all the same size, for classroom activities. Of the 15 dice , 4 are Red, 5 are Black, 2 are Blue and 4 are Green. What is the probability that a randomly drawn dice will NOT be black?
1) 0.333
2)0.667
3)0.500
4)0.600
i think # 3
number of black = 5, total = 15
prob(black) = 5/15 = 1/3
so prob(not black) = 1 - 1/3 = 2/3
which decimal comes closest to that?