a bag contains 20 marbles containing 8 green, 4 red, 2 blue, 6 yellow. If a person picks out 1 single marble from bag without looking. what is the probability that it will be a red marble?

4/20 = 1/5

What is it

To find the probability of picking a red marble, we need to know the total number of marbles in the bag and the number of red marbles.

In this case, we are given that the bag contains a total of 20 marbles, which consist of 8 green, 4 red, 2 blue, and 6 yellow marbles.

The probability of picking a red marble can be calculated by dividing the number of red marbles by the total number of marbles in the bag.

So, the probability of picking a red marble = Number of red marbles / Total number of marbles

Substituting the values,
Probability of picking a red marble = 4 / 20

Simplifying,
Probability of picking a red marble = 1 / 5

Hence, the probability of picking a red marble is 1/5 or 0.2, which can also be written as 20%.