A jar contains 40 red marbles and 10 black marbles.  If you take a random sample of one marble from this jar, what is the probability that it will be red

To find the probability of randomly selecting a red marble from the jar, you can use the formula:

\[
P(\text{red marble}) = \frac{\text{number of red marbles}}{\text{total number of marbles}}
\]

Given:
- Number of red marbles = 40
- Number of black marbles = 10

The total number of marbles is:

\[
\text{Total marbles} = 40 + 10 = 50
\]

So, the probability of drawing a red marble is:

\[
P(\text{red marble}) = \frac{40}{50} = \frac{4}{5} = 0.8
\]

Thus, the probability of selecting a red marble is **0.8** or **80%**.

Would you like more details or have any questions?

Here are 5 related questions:
1. What is the probability of selecting a black marble?
2. What is the probability of not selecting a red marble?
3. If two marbles are drawn without replacement, what is the probability that both are red?
4. If two marbles are drawn with replacement, what is the probability that both are red?
5. How would the probability change if 5 more black marbles were added to the jar?

**Tip:** Probabilities always add up to 1 for all possible outcomes in a random experiment.

A jar contains 40 red marbles and 10 black marbles. If you take a random sample of one marble from this jar, what is the probability that it will be red?

Learn how to calculate the probability of drawing a red marble from a jar containing 40 red marbles and 10 black marbles. This problem demonstrates key concepts in probability, including calculating the likelihood of an event. Suitable for students in Grades 6-8.

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