# Thread: independent or dependent?

1. ## independent or dependent?

1. Of 10 students in a classroom, 4 are taking only history, 3 are taking only math, and 3 are taking both history and math. If you select a student uniformly at random, the event of this student taking history and the event that this student taking math are: 2.
Two fair six-sided dice are rolled at the same time. The event that the first die is 1 and the event that two dice sum up to be 7 are 2. ## Re: independent or dependent?

For (1) the crucial point is that there are 3 students taking both. What are your thoughts on (2)?

3. ## Re: independent or dependent?

I think:
For (1) dependen
For (2) independent
how about your think?

4. ## Re: independent or dependent? Originally Posted by Amanda2018 I think:
For (1) dependen
For (2) independent
how about your think?
If two events are INDEPENDENT then P(A and B) = P(A) x P(B).

In Q1, what is P(H and M)? What is P(H)? Whats is P(M)? Does P(H and M) = P(H) x P(M) ?

5. ## Re: independent or dependent?

In Q1, P(H and M) = 3/10
P(M) = 4/10
P(H) = 3/10

P(H and M) ≠ P(H) x P(M)

pues, DEPENDEN