The table shows the results of randomly selecting colored marbles from a bag 36 times. The marble was returned to the bag after each selection.
8 white 14 red 9black 5 blue
Based on these results, what is the expected probability of randomly selecting a black marble from the bag in one attempt?
The total number of marbles selected is 36. The number of black marbles selected is 9.
Therefore, the expected probability of randomly selecting a black marble from the bag in one attempt is:
9/36 = 1/4 = 0.25
So, the expected probability is 0.25 or 25%.