A bag contains 12 blue, 5 red and 3 green marbles. Amy selects a marble and then returns it to the bag before selecting a marble again. If Amy selects a blue marble 4 out of 20 times, what is the experimental probability that the next she selects will be blue?
To find the experimental probability of selecting a blue marble on the next try, we need to consider the total number of times Amy selects a marble and the number of times she selects a blue marble.
In this scenario, Amy selects marbles 20 times, and 4 out of those 20 times, she selects a blue marble.
To calculate the experimental probability, we divide the number of successful outcomes (selecting a blue marble) by the total number of outcomes:
Experimental Probability = Number of successful outcomes / Total number of outcomes
Number of successful outcomes: 4 (selecting a blue marble)
Total number of outcomes: 20 (total selections)
Therefore, the experimental probability of selecting a blue marble on the next try is:
Experimental Probability = 4 / 20 = 0.2 or 20%
there are 12 + 5 + 3 = 20 marbles in the bag.
We do an experiment to find out how many are blue
call the probability of a blue one x
She picks blue 4 out of twenty times, which is 20/100 = 0.20
Her fingers must reject blue because one would expect 12/20 = 0.60