Question

Mr. Schultz is randomly distributing 15 rulers with centimeter markings and 10 rulers without centimeter markings to his class. What is the probability that the first ruler he hands out will have centimeter markings and the second one does not have the markings?.

Answer 1

Using it's concept, it is found that there is a 0.25 = 25% probability that the first ruler will have centimeter markings and the second one will not.

What is a probability?

A probability is given by the number of desired outcomes divided by the number of total outcomes.

In this problem:

• For the first ruler, there are 15 with markings out of 25, hence P(A) = 15/25.

• For the second ruler, there are 10 without markings out of 24, hence P(B|A) = 10/24.

Thus, the probability is given by:

$P(A \cap B) = P(A)P(B|A) = \frac{15}{25} \times \frac{10}{24} = 0.25$

0.25 = 25% probability that the first ruler will have centimeter markings and the second one will not.

More can be learned about probabilities at https://brainly.com/question/14398287