Roberto drew a marble at random from a bag containing 7 blue, 2 red, 8 green, and 6 black marbles. What is the probability that he picked a marble that is Not blue?
A:7/23 B:16/23 C:7/16 D:2/3
so, how many total marbles?
How many are not blue?
you know, you don't have to start a whole new thread to add stuff to your post...
help me with this math test
To calculate the probability of picking a marble that is not blue, we need to find the total number of non-blue marbles and divide it by the total number of marbles in the bag.
First, we need to determine the total number of marbles in the bag:
Total number of marbles = number of blue marbles + number of red marbles + number of green marbles + number of black marbles
Total number of marbles = 7 + 2 + 8 + 6 = 23
Next, we need to find the number of marbles that are not blue:
Number of non-blue marbles = number of red marbles + number of green marbles + number of black marbles
Number of non-blue marbles = 2 + 8 + 6 = 16
Finally, we can calculate the probability:
Probability of picking a marble that is not blue = Number of non-blue marbles / Total number of marbles
Probability of picking a marble that is not blue = 16 / 23
Therefore, the probability that Roberto picked a marble that is not blue is 16/23.
The correct answer is B: 16/23.