What is the upper quartile of the data set below
25, 8, 10, 35, 5, 45, 40, 30, 20
A. 5
B. 8
C. 9
D. 10
1. C
2. B
3. C
4. D
5. A
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The upper quartile is the median of just the upper half of the data.
Just like the median, its value depends on whether you have an even or odd number of pieces of data.
First place your data in ascending order:
5, 8, 10, 20, 25, 30, 35, 40, 45
You have 9 pieces of data, which is an odd number, so the median is the middle value, 25.
Now look at just the upper half of the data:
30, 35, 40, 45 (we don't include the median, but we would have done this differently if your original set had an even number of pieces of data).
This upper half has 4 pieces of data, an even number. Hence the median of it (known as the upper quartile) is the average of the two middle pieces of data: 35 and 40.
(35 + 40) / 2 = 37.5
1: c
2: b
3: c
4: d
5: a
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I don't understand this question can someone please explain what an upper quartile is?!?
Ok I'll comment (see i just commented on your comment)
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