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# If x is to be selected at random from set T, what is the

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If x is to be selected at random from set T, what is the [#permalink]

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13 Aug 2007, 19:38
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If x is to be selected at random from set T, what is the probability that 1/4x-5<=0?

1) T is a set of 8 integers
2) T is contained in the set of integers from 1 to 25, inclusive.
Director
Joined: 03 May 2007
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14 Aug 2007, 07:17
helpmeongmat wrote:
If x is to be selected at random from set T, what is the probability that 1/4x-5<=0?

1) T is a set of 8 integers
2) T is contained in the set of integers from 1 to 25, inclusive.

Can you repost the question again whether 1/4x-5<=0 is:

1 / (4x) - 5 <= 0 or
(1 / 4) x - 5 <= 0 or
1 / (4x - 5) <= 0 ?

i guess i did it before but do not remember.......
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14 Aug 2007, 07:53
helpmeongmat wrote:
If x is to be selected at random from set T, what is the probability that 1/4x-5<=0?

1) T is a set of 8 integers
2) T is contained in the set of integers from 1 to 25, inclusive.

Regardless of the question, I think the answer should be E.
You can solve for x in the equation above.
I use (1/4)*x - 5 <= 0 => x<=20

So we are trying to find the probability when x<=20. We need to know how many integers in the set + the values of those integers.

1) Don't know any values, INSUFFICIENT
2) If T is contained in the set of 1 to 25, it can be 1-20, 1-5, etc. We don't really know what it is.
INSUFFICIENT

Together, we still don't know.
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14 Aug 2007, 22:35
St1:
Insufficient. We do not know what integers are inside the set.

St2:
T can have elements from 1-25. We do not know which elements, so st2 is insufficient.

Using both st1 and st2, nothing new is made known to us. Insufficient.

Ans E
14 Aug 2007, 22:35
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