Question

1. the probability of picking a red marble is 3/10. if there are 30 marbles in the jar, how many are red?

Explanation:

Step1: Recall probability formula

The number of red marbles = Probability of red marble × Total marbles.

Step2: Substitute values

Probability of red marble is $\frac{3}{10}$, total marbles is 30. So number of red marbles = $\frac{3}{10} \times 30$.

Step3: Calculate

$\frac{3}{10} \times 30 = 3 \times 3 = 9$.

Answer:

9