you select a marble without looking and then put it back. if you do this 8 times, what is the best…
you select a marble without looking and then put it back. if you do this 8 times, what is the best prediction possible for the number of times you will pick a marble that is not blue?
Answer
Explanation:
Step1: Calculate total marbles
There are 3 blue marbles and 5 non - blue marbles, so total marbles = 3 + 5=8.
Step2: Calculate probability of picking non - blue
Probability of picking a non - blue marble $P=\frac{5}{8}$.
Step3: Predict number of non - blue picks
We pick 8 times. The expected number of times of picking non - blue is $n = 8\times\frac{5}{8}$. $n = 5$.
Answer:
5