A bag has 40 marbles how many marbles should be read if the probability of randomly choosing red is 30%

Step-by-step explanation:

Probability is a way of expressing the chances of an outcome in math.

In this problem, there is a 30% (30 percent) chance of choosing a red marble out of 40 marbles

We can convert 30% to a decimal by dividing it by 100

30 -> .3

We can then multiply that decimal by the total amount of marbles

.3 * 40

12 marbles should be red.