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?
To find the expected probability of randomly selecting a black marble from the bag in one attempt, we need to calculate the proportion of black marbles out of the total number of marbles selected.
Total number of marbles selected = 36 (the sum of all the marbles selected)
Number of black marbles selected = 9
Expected probability = Number of black marbles selected / Total number of marbles selected
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%.