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.
White Red Black Blue
Number of
Times
Selected 8 14 9 5
Based on these results, what is the expected probability of randomly selecting a black marble from the bag in one attempt?
The expected probability of randomly selecting a black marble can be calculated by dividing the number of times black was selected by the total number of selections:
Expected probability = Number of times black was selected / Total number of selections
Expected probability = 9 / 36
Expected probability = 0.25
Therefore, the expected probability of randomly selecting a black marble from the bag in one attempt is 0.25 or 25%.