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10 Aug 2009, 23:28
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At Rocktown college , the 400 students taking psychology 101 receuved an average score of 76 in the final exam, and the scores had a normal distribution. The bottom 16% of the scores will receive a failing grade. What is the score at or below which students fail the course?
1) 8 students receive a score of 96 or higher.
2) The standard deviation for the final exam was 10 points.
What is the ratio of x to Y?
1) .8x + .5y = 40
2) .625y = 50 -x
( got y =0 then should i be taking E as the answer because x/0 is undefined)
if x+ 2y =11. What is the valus of X?
a) 3x-y = 12
b) x^2 - 4y = 21
My answer :
Jinhee spent 65$ on hats. If she bought only derbies and fedoras. how many debies did she buy?
1) Jinhee bought derbies for 5$ each and fedoras for 10$ each.
2) Jinhee bought a total of 8 hats.
My answer : .
( I remember a similar problem in the GMAT prep which has A as the answer, But here there are more solution for statment 1 ). Please correct me.
At Rocktown college , the 400 students taking psychology 101 receuved an average score of 76 in the final exam, and the scores had a normal distribution. The bottom 16% of the scores will receive a failing grade. What is the score at or below which students fail the course?
1) 8 students receive a score of 96 or higher.
2) The standard deviation for the final exam was 10 points.
What is the ratio of x to Y?
1) .8x + .5y = 40
2) .625y = 50 -x
( got y =0 then should i be taking E as the answer because x/0 is undefined)
if x+ 2y =11. What is the valus of X?
a) 3x-y = 12
b) x^2 - 4y = 21
My answer :
Jinhee spent 65$ on hats. If she bought only derbies and fedoras. how many debies did she buy?
1) Jinhee bought derbies for 5$ each and fedoras for 10$ each.
2) Jinhee bought a total of 8 hats.
My answer : .
( I remember a similar problem in the GMAT prep which has A as the answer, But here there are more solution for statment 1 ). Please correct me.
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11 Aug 2009, 05:07
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What is the ratio of x to Y?
1) .8x + .5y = 40
2) .625y = 50 -x
ST1:
.8x + .5y = 40
Multiplying by 10 on both sides, we get:
=> 8x + 5y = 400 .......... I
Statement I by itself is NOT SUFFICIENT
ST2:
.625y = 50 -x
Rearranging the terms and multiplying by 8 on both sides, we get:
=> 8x + 5y = 400 .......... II
Statement II by itself is NOT SUFFICIENT
ST1 & ST2 Together:
From equations I & II we observe that both the statements contain the same equation and thus cannot be solved to find a unique solution.
Statements I & II together are NOT SUFFICIENT
ANS: E
1) .8x + .5y = 40
2) .625y = 50 -x
ST1:
.8x + .5y = 40
Multiplying by 10 on both sides, we get:
=> 8x + 5y = 400 .......... I
Statement I by itself is NOT SUFFICIENT
ST2:
.625y = 50 -x
Rearranging the terms and multiplying by 8 on both sides, we get:
=> 8x + 5y = 400 .......... II
Statement II by itself is NOT SUFFICIENT
ST1 & ST2 Together:
From equations I & II we observe that both the statements contain the same equation and thus cannot be solved to find a unique solution.
Statements I & II together are NOT SUFFICIENT
ANS: E
11 Aug 2009, 05:23
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if x+ 2y =11. What is the value of X?
a) 3x-y = 12
b) x^2 - 4y = 21
ST1:
x+ 2y =11 & 3x-y = 12 can be solved simultaneously to yield the value of x.
Statement I is SUFFICIENT
ST2:
Solving x+ 2y=11 & x^2 - 4y = 21 yields a quadratic equation in x which gives two unequal roots => No unique solution.
Statement II is NOT SUFFICIENT
ANS: A
a) 3x-y = 12
b) x^2 - 4y = 21
ST1:
x+ 2y =11 & 3x-y = 12 can be solved simultaneously to yield the value of x.
Statement I is SUFFICIENT
ST2:
Solving x+ 2y=11 & x^2 - 4y = 21 yields a quadratic equation in x which gives two unequal roots => No unique solution.
Statement II is NOT SUFFICIENT
ANS: A
