Question

what is the theoretical probability of randomly picking a blue circle?

Explanation:

Step1: Count total circles

There are 7 circles in total.

Step2: Count blue circles

There are 3 blue circles.

Step3: Calculate probability

The probability formula is $P=\frac{\text{number of favorable outcomes}}{\text{total number of outcomes}}$. So $P = \frac{3}{7}$.

Answer:

$\frac{3}{7}$