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During an experiment, Emily collected 11 different temperature reading

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During an experiment, Emily collected 11 different temperature reading  [#permalink]

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New post 25 Feb 2020, 00:15
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During an experiment, Emily collected 11 different temperature readings, all of which were integers. How many of the temperature readings were negative?

(1) The median temperature reading was -1.
(2) Exactly five of the temperature readings were positive.

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Re: During an experiment, Emily collected 11 different temperature reading  [#permalink]

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New post 25 Feb 2020, 06:19
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(1) The median temperature reading was -1.
Because Emily collected 11 different temperature readings, all of which were integers, then the next readings (7th to 11th) would be either 0 or positive. Thus, there were 6 negative temperature readings.
SUFFICIENT

(2) Exactly five of the temperature readings were positive.
There could be five to six negative temperature readings, but we cannot deduce exact number of negative temperature readings.
NOT SUFFICIENT

FINAL ANSWER IS (A)

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Re: During an experiment, Emily collected 11 different temperature reading  [#permalink]

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New post 25 Feb 2020, 08:04
#1
The median temperature reading was -1.
it means that there must be 5 other readings which must be -ve ; making total = 6
sufficient
#2
Exactly five of the temperature readings were positive.
so balance 6 readings can be -ve or one of them could 0 so insufficient
IMO A

During an experiment, Emily collected 11 different temperature readings, all of which were integers. How many of the temperature readings were negative?

(1) The median temperature reading was -1.
(2) Exactly five of the temperature readings were positive.
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Re: During an experiment, Emily collected 11 different temperature reading  [#permalink]

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New post 25 Feb 2020, 09:00
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During an experiment, Emily collected 11 different temperature readings, all of which were integers. How many of the temperature readings were negative?

(1) The median temperature reading was -1.
6th reading is -1 hence 5 reading before that were negative. Total negative readings = 6

SUFFICIENT.

(2) Exactly five of the temperature readings were positive.
Other 6 readings can all be negative or one of them can be 0 so 5 negative readings.

INSUFFICIENT.

Answer A.
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Re: During an experiment, Emily collected 11 different temperature reading  [#permalink]

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New post 25 Feb 2020, 11:52
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During an experiment, Emily collected 11 different temperature readings, all of which were integers. How many of the temperature readings were negative?

(1) The median temperature reading was -1. >For 11 elements, the 6th element is the median. As the 6th one is a negative integer, the previous 5 are also negative and the 7th one will be either 0 or positive integers (it is said all of them are different). Hence, sufficient.
(2) Exactly five of the temperature readings were positive > The other 7 may be all negative or 6 of them are negative and the remaining one is 0. so not sufficient.
A is the CA.
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During an experiment, Emily collected 11 different temperature reading  [#permalink]

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New post Updated on: 26 Feb 2020, 03:29
Quote:
During an experiment, Emily collected 11 different temperature readings, all of which were integers. How many of the temperature readings were negative?

(1) The median temperature reading was -1.
(2) Exactly five of the temperature readings were positive.


(1) sufic
median is the 6th = -1;
readings from 1st to 6th are negative;
reading from 7th to 11th could zero and positives, or all positives.

(2) insufic
5 positives, then 6 could be any combination of negatives with or without 0.

Ans (A)

Originally posted by exc4libur on 25 Feb 2020, 17:08.
Last edited by exc4libur on 26 Feb 2020, 03:29, edited 1 time in total.
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Re: During an experiment, Emily collected 11 different temperature reading  [#permalink]

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New post 25 Feb 2020, 23:42
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(Statement1): The median temperature reading was -1.
The next temperature reading after the median is greater or equal to zero.
—> exactly 6 tem.readings are negative
Sufficient

(Statement2) Exactly five of the temperature readings were positive.
—> one of the any other temperature readings could be zero.
Well, the rest 6 or 5 tem.readings could be negative
Insufficient

The answer is A.

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Re: During an experiment, Emily collected 11 different temperature reading  [#permalink]

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New post 26 Feb 2020, 00:05
During an experiment, Emily collected 11 different temperature readings, all of which were integers. How many of the temperature readings were negative?

(1) The median temperature reading was -1.
(2) Exactly five of the temperature readings were positive.
Solution:
From statement (1), 1st… …… 2nd …..3rd ….4th …..5th …..6th ……7th ……8th …..9th …..10th …..11th
----------------------------------------------Median-------------------------------------------
……………………………………………………………...(-1)…………………………………………………………..
From this , There may be 5 negative readings or There may be 4 negative readings and another one is o(zero), Not Sufficient.
Statement (2) is same as statement (1). Not sufficient.

Answer: E
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Re: During an experiment, Emily collected 11 different temperature reading   [#permalink] 26 Feb 2020, 00:05
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