What is the probability of randomly selecting a red marble from a jar that contains 10 red marbles and 20 blue marbles?
red/(red plus blue) = ?
To find the probability of randomly selecting a red marble from the jar, we need to determine the ratio of red marbles to the total number of marbles.
Step 1: Calculate the total number of marbles in the jar.
- In this case, the jar contains 10 red marbles and 20 blue marbles, so the total number of marbles is 10 + 20 = 30.
Step 2: Calculate the probability of selecting a red marble.
- Since there are 10 red marbles and a total of 30 marbles, the probability of selecting a red marble is 10/30, which simplifies to 1/3 or approximately 0.3333.
Therefore, the probability of randomly selecting a red marble from the jar is 1/3 or approximately 0.3333.
To calculate the probability of randomly selecting a red marble from the jar, you need to know the total number of marbles and the number of red marbles.
In this case, the jar contains 10 red marbles and 20 blue marbles. The total number of marbles is the sum of the red and blue marbles, which is 10 + 20 = 30.
To find the probability, divide the number of favorable outcomes (selecting a red marble) by the number of possible outcomes (all the marbles in the jar).
So, the probability of randomly selecting a red marble can be calculated as:
Probability = Number of red marbles / Total number of marbles
Probability = 10 / 30
Probability = 1/3 or approximately 0.3333
Therefore, the probability of randomly selecting a red marble from the jar is 1/3 or approximately 0.3333.