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The table above shows the total sales recorded in July for

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The table above shows the total sales recorded in July for [#permalink] New post 01 Feb 2012, 07:01
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

66% (02:18) correct 34% (01:05) wrong based on 61 sessions
Ann $450,000
Bob $360,000
Cal $190,000
Dot $210,000
Ed $680,000

The table above shows the total sales recorded in July for the 5 salespeople at Acme Truck Sales. It was discovered that one of Cal's sales was incorrectly recorded as one of Ann's sales. After this error was corrected, Ann's total sales were still higher than Cal's total sales, and the median of the 5 sales totals was $330,000. What was the value of the incorrectly recorded sale?
A. $30,000
B. $48,000
C. $90,000
D. $120,000
E. $140,000

Can anyone please help with this......
[Reveal] Spoiler: OA

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Re: Statistics [#permalink] New post 01 Feb 2012, 09:43
Expert's post
Ann $450,000
Bob $360,000
Cal $190,000
Dot $210,000
Ed $680,000

The table above shows the total sales recorded in July for the 5 salespeople at Acme Truck Sales. It was discovered that one of Cal's sales was incorrectly recorded as one of Ann's sales. After this error was corrected, Ann's total sales were still higher than Cal's total sales, and the median of the 5 sales totals was $330,000. What was the value of the incorrectly recorded sale?

A. $30,000
B. $48,000
C. $90,000
D. $120,000
E. $140,000

Old sales: {Cal=190, 210, 360, Ann=450, 680}.

Now, the median of a set with odd # of terms is just a middle term (when ordered in ascending /descending order). So, old median=360.

We know that new median=330 and Cal's sales are still less than Ann's, hence Ann's new sales must be 330 (Ann's sales # must be reduced so that it becomes the middle term: 360 and Ann must switch places): {210, Cal, Ann=330, 360, 680}.

The value of the incorrectly recorded sale is Ann's old sales - Ann's new sales = 450 - 330 = 120.

Answer: D.

Hope it's clear.

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Re: Statistics [#permalink] New post 01 Feb 2012, 15:20
Bunuel wrote:
Ann $450,000
Bob $360,000
Cal $190,000
Dot $210,000
Ed $680,000

The table above shows the total sales recorded in July for the 5 salespeople at Acme Truck Sales. It was discovered that one of Cal's sales was incorrectly recorded as one of Ann's sales. After this error was corrected, Ann's total sales were still higher than Cal's total sales, and the median of the 5 sales totals was $330,000. What was the value of the incorrectly recorded sale?

A. $30,000
B. $48,000
C. $90,000
D. $120,000
E. $140,000

Old sales: {Cal=190, 210, 360, Ann=450, 680}.

Now, the median of a set with odd # of terms is just a middle term (when ordered in ascending /descending order). So, old median=360.

We know that new median=330 and Cal's sales are still less than Ann's, hence Ann's new sales must be 330 (Ann's sales # must be reduced so that it becomes the middle term: 360 and Ann must switch places): {210, Cal, Ann=330, 360, 680}.

The value of the incorrectly recorded sale is Ann's old sales - Ann's new sales = 450 - 330 = 120.

Answer: D.

Hope it's clear.


Hi Bunnel

Here how do we now that Ann's sales=330. The question says ann's sales were higher than cal's and we are not sure about any particular value and we too don't know how much cal's sales were increased, so how can we order the list in the this way

{210, Cal, Ann=330, 360, 680}.

Plz correct me if i am wrong

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Re: Statistics [#permalink] New post 01 Feb 2012, 15:25
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kotela wrote:
Hi Bunnel

Here how do we now that Ann's sales=330. The question says ann's sales were higher than cal's and we are not sure about any particular value and we too don't know how much cal's sales were increased, so how can we order the list in the this way

{210, Cal, Ann=330, 360, 680}.

Plz correct me if i am wrong


First of all either Cal's or Ann's sales must be 330. Now, if Cal's sales are 330 then as Ann>Cal then the ordering would be {210, Cal=330, Ann>Cal, 360, 680} --> median={Ann's sales}>330, but we know that the median is 330, so this case is not possible.

Hope it's clear.

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COLLECTION OF QUESTIONS:
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Re: Statistics [#permalink] New post 01 Feb 2012, 17:22
Bunuel wrote:
kotela wrote:
Hi Bunnel

Here how do we now that Ann's sales=330. The question says ann's sales were higher than cal's and we are not sure about any particular value and we too don't know how much cal's sales were increased, so how can we order the list in the this way

{210, Cal, Ann=330, 360, 680}.

Plz correct me if i am wrong


First of all either Cal's or Ann's sales must be 330. Now, if Cal's sales are 330 then as Ann>Cal then the ordering would be {210, Cal=330, Ann>Cal, 360, 680} --> median={Ann's sales}>330, but we know that the median is 330, so this case is not possible.

Hope it's clear.


ya that makes sense...

I always miss reading small parts in a sentence...

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Re: The table above shows the total sales recorded in July for [#permalink] New post 23 May 2013, 04:38
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Re: The table above shows the total sales recorded in July for [#permalink] New post 23 May 2013, 09:59
Expert's post
mydreammba wrote:
Ann $450,000
Bob $360,000
Cal $190,000
Dot $210,000
Ed $680,000

The table above shows the total sales recorded in July for the 5 salespeople at Acme Truck Sales. It was discovered that one of Cal's sales was incorrectly recorded as one of Ann's sales. After this error was corrected, Ann's total sales were still higher than Cal's total sales, and the median of the 5 sales totals was $330,000. What was the value of the incorrectly recorded sale?
A. $30,000
B. $48,000
C. $90,000
D. $120,000
E. $140,000


Let the transaction amount be x. Given that 450,000-x>190,000+x --> 2x<260,000 --> x<130,000

Now the new median is 330,000. As the only 2 values changing are that of Cal's and Ann's, this new median must be either the increased sales figure of Cal, or the deflated sales figure of Ann.

Cal : 330,000-190,000 =x = 140,000--> Not possible as x<130,000. Thus the median is the new sales figure of Ann --> 450,000-330,000 = 120,000.
D.

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Re: The table above shows the total sales recorded in July for [#permalink] New post 25 May 2013, 23:53
mydreammba wrote:
Ann $450,000
Bob $360,000
Cal $190,000
Dot $210,000
Ed $680,000

The table above shows the total sales recorded in July for the 5 salespeople at Acme Truck Sales. It was discovered that one of Cal's sales was incorrectly recorded as one of Ann's sales. After this error was corrected, Ann's total sales were still higher than Cal's total sales, and the median of the 5 sales totals was $330,000. What was the value of the incorrectly recorded sale?
A. $30,000
B. $48,000
C. $90,000
D. $120,000
E. $140,000

Can anyone please help with this......


My approach:
As question stem tells that median is 330000, take a quick look for the other salesmen to match this median. None has 330000 sales. Thus this must of of either Ann's or cal's.

besides that question further tells ann's and cal's amount is misplaced. so let us try to make Ann's sells 330000. Then we have to reduce 12000. this will be added to cal's and become 310000. this satisfies the condition that:

Ann's sales amount > Cal's sales amount.

To verify check by making Cal's amount 330000 above mentioned condition will be violated.

Thus The misplaced amount is 120000.

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Re: The table above shows the total sales recorded in July for   [#permalink] 25 May 2013, 23:53
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