# Thread: Probability question

1. ## Probability question

Q: Given a balanced spinner (like the kind you use for twister) divided into quarters, find the following probabilities...

a) $\displaystyle A={1/4}$

b) $\displaystyle A=[\frac{1}{4},\frac{3}{8}]$

A:

(a) $\displaystyle P(A)=\empty$

(b) I am not sure how to do this one. I keep getting 32.5%, but that cant be.

How do I do this systematically?

Thank you

2. Originally Posted by Danneedshelp
Q: Given a balanced spinner (like the kind you use for twister) divided into quarters, find the following probabilities...

a) $\displaystyle A={1/4}$

b) $\displaystyle A=[\frac{1}{4},\frac{3}{8}]$

A:

(a) $\displaystyle P(A)=\empty$

(b) I am not sure how to do this one. I keep getting 32.5%, but that cant be.

How do I do this systematically?

Thank you
What is A meant to represent?

3. Originally Posted by mr fantastic
What is A meant to represent?
a) The probability of landing on 1/4 exactly

b) The probability of landing within the given interval.

4. Originally Posted by Danneedshelp
a) The probability of landing on 1/4 exactly

b) The probability of landing within the given interval.
I still don't get it. From what you've said, surely Pr(A = 1/4) = 1/4. And Pr(1/4 < A < 3/8) = 3/8 - 1/4 = 1/8.