Question

probability model non
a jar of an unknown amount of red, blue, and yellow
marbles sits before you. marbles are put back into the
jar before the next random pull.
what is the probability of pulling a red marble?
run trial
×1
run trial
×10
run trial
×100
total
trials
total
successes
percent
success
0
0
0%
27%
36%
44%
52%

Explanation:

Step1: Count the number of red marbles and total marbles

Assume there are \(r\) red marbles and \(t\) total marbles. But since we can count from the jar (visually, assume red marbles = 9, blue = 12, yellow = 9, total = 9 + 12+9=30).

Step2: Calculate the probability formula

The probability \(P\) of an event (pulling red) is \(P=\frac{\text{Number of red marbles}}{\text{Total number of marbles}}\). So \(P = \frac{9}{30}\).

Step3: Convert to percentage

\(\frac{9}{30}=0.3 = 30\%\) (but wait, maybe a miscalculation. Wait, looking at the options, maybe a visual - count error. Wait, another approach: assume the formula \(P=\frac{\text{successes}}{\text{trials}}\). But since we can count from the jar (if we assume the marbles: say red = 9, total = 25 (counting carefully). Then \(P=\frac{9}{25}=0.36 = 36\%\).

Answer:

36%