Question

you select a marble without looking and then put it back. if you do this 35 times, what is the best prediction possible for the number of times you will pick a marble that is not orange? times

Explanation:

Step1: Count total and non - orange marbles

From the image, total marbles = 5 (4 orange + 1 non - orange). Number of non - orange marbles = 1. Probability of picking a non - orange marble, $P=\frac{1}{5}$.

Step2: Calculate expected number of non - orange picks

We do the experiment 35 times. The expected number of times we pick a non - orange marble is the number of trials times the probability of picking a non - orange marble. So, $35\times\frac{1}{5}=7$.

Answer:

7