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Stat / Median

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Stat / Median [#permalink] New post 05 May 2009, 05:19
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

100% (01:00) correct 0% (00:00) wrong based on 0 sessions
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Stat qts.doc [69.5 KiB]
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Re: Stat / Median [#permalink] New post 05 May 2009, 06:22
tenaman10 wrote:
Attachment:
Stat qts.doc


For odd number of list values.. median .. middle number.

For even number of list of values median is average two middle numbers.

in this problem. 73 values.. median value 37 the value when you arrange in ascending order.

Answer is clearly C.


Still confused.

See below e.g.

Find the median for the following list of values:
13, 18, 13, 14, 13, 16, 14, 21, 13

The median is the middle value, so I'll have to rewrite the list in order:

13, 13, 13, 13, 14, 14, 16, 18, 21

There are nine numbers in the list, so the middle one will be the (9 + 1) ÷ 2 = 10 ÷ 2 = 5th number:

13, 13, 13, 13, 14, 14, 16, 18, 21
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Re: Stat / Median [#permalink] New post 05 May 2009, 06:24
Expert's post
72/2 +1 = 37th score represents median.
Now, let's find to which interval 37th score belongs:
50-59 : 2 : the total number of the scores: 2
60-69 : 10 : the total number of the scores: 12 = 2 + 10
70-79 : 16 : the total number of the scores: 28 = 12 + 16
80-89 : 27 : the total number of the scores: 55 = 28 + 27 - So, 37th score (our median) belongs to 80-89 interval.
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Re: Stat / Median   [#permalink] 05 May 2009, 06:24
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