Answer:
36
Step-by-step explanation:
Firstly, let’s find the probability of taking up a white marble or a gray marble.
We add up all the marbles at first; 27 + 4 + 5 = 36 marbles
The probability of selecting a white marble is 4/36 = 1/9
The probability of selecting a gray marble is 5/36
The probability of selecting a white or gray marble is the addition of both probabilities = 4/36 + 5/36 = 9/36 or 1/4
Now out of 144 tries, how many times do we select a white or gray marble.
That would be 1/4 * 144 = 36 times
so we are expecting 36 of white or gray marbles
