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Find the mean of the data.

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Find the mean of the data.  [#permalink]

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New post 15 Jan 2019, 08:21
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Find the mean of the data.

1. The data has 8 data values

2. The data is 3, 4, 5, 6, 4, 1, 0, 5

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Re: Find the mean of the data.  [#permalink]

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New post 15 Jan 2019, 10:27
The answer is B.
in order to find the mean, we need the number of values (n) and the actual values.

A - no data on the actual values - insufficient!
B - both the actual values and the number of values (just count them) - sufficient!
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Re: Find the mean of the data.  [#permalink]

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New post 15 Jan 2019, 21:45
When we arrange data in increasing order, middle value is the mean.

Statement 1; doesn't tell us what middle value might be. Thus insufficient.

Statement 2: give us all the data. Here if we arrange increasing order, 0,1,3,4,4,5,5,6
We can clearly see, 4 is middle value and thus mean.
Thus it is sufficient.

Answer is B

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Re: Find the mean of the data.  [#permalink]

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New post 15 Jan 2019, 22:53
UdayPratapSingh99 wrote:
When we arrange data in increasing order, middle value is the mean.

Statement 1; doesn't tell us what middle value might be. Thus insufficient.

Statement 2: give us all the data. Here if we arrange increasing order, 0,1,3,4,4,5,5,6
We can clearly see, 4 is middle value and thus mean.
Thus it is sufficient.

Answer is B

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Correction : middle value is the median and not the mean

Mean = \(\frac{Sum of Values}{number of values}\)
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Re: Find the mean of the data.   [#permalink] 15 Jan 2019, 22:53
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