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A research report states that the average (arithmetic mean)
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22 Nov 2019, 11:13
22 Nov 2019, 11:13
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A research report states that the average (arithmetic mean) of 120 measurements was 72.5, the greatest of the 120 measurements was 92.8, and the range of the 120 measurements was 51.6.
The information given above is sufficient to determine the value of which of the following statistics?
Indicate all such statistics.
A. The least of the 120 measurements
B. The median of the 120 measurements
C. The standard deviation of the 120 measurements
D. The sum of the 120 measurements
Kudos for the right answer and solution.
The information given above is sufficient to determine the value of which of the following statistics?
Indicate all such statistics.
A. The least of the 120 measurements
B. The median of the 120 measurements
C. The standard deviation of the 120 measurements
D. The sum of the 120 measurements
Kudos for the right answer and solution.
Re: A research report states that the average (arithmetic mean)
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23 Nov 2019, 15:47
23 Nov 2019, 15:47
This problem looks like GMAT's data sufficiency problems.
Answers A,D
Answers A,D
Manager
Joined: 20 Jun 2019
Posts: 181
Given Kudos: 41
GRE 1: Q160 V161
GRE 2: Q165 V159
Re: A research report states that the average (arithmetic mean)
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29 Jun 2020, 00:12
29 Jun 2020, 00:12
1
We know that N=120 and µ=72.5, max=92.8, range=51.6.
Let's look at the statements now.
A- Can be calculated. 92.8–x=51.6 so min=41.2.
B- Median is going to be the 60th+61st term/2. This can not be calculated.
C- We need EACH value of the dataset to calculate SD via the formula so this isn't possible.
D- Sum is nothing but µ*Qty which is 92.8*120=8700.
Let's look at the statements now.
A- Can be calculated. 92.8–x=51.6 so min=41.2.
B- Median is going to be the 60th+61st term/2. This can not be calculated.
C- We need EACH value of the dataset to calculate SD via the formula so this isn't possible.
D- Sum is nothing but µ*Qty which is 92.8*120=8700.
